The Complete Guide to Marketing Agency Onboarding (30-60-90 Day Plan)

The first 90 days with a new marketing agency determine whether you'll see breakthrough results or disappointing mediocrity. Yet 73% of agency relationships fail within the first year, often due to poor onboarding rather than incompetent execution.

After transitioning 200+ brands to new agencies and perfecting our onboarding process at ATTN, here's the definitive guide to setting your agency relationship up for long-term success.

Pre-Onboarding: Setting the Foundation (Week -2 to 0)

Document Your Current State

Before your new agency starts, create a comprehensive performance baseline:

Performance Documentation:

Last 90 days of ad spend by channel
ROAS and CAC by campaign type
Top-performing creative assets and angles
Audience segments and their performance
Attribution model and tracking setup

Access Audit:

All ad accounts and their ownership structure
Analytics platforms (GA4, Triple Whale, Northbeam)
Creative asset libraries and brand guidelines
Email/SMS platform access
Website admin credentials

Team Introductions:

Internal marketing team roles and responsibilities
Decision-making hierarchy for budget and creative approval
Preferred communication cadence and methods
Success metrics and business priorities

Prepare Asset Transfer

Creative Assets:

Export high-performing ad creative with performance data
Compile brand guidelines, logo files, and design assets
Document creative angles that have worked (and failed)
Prepare product photography and videography libraries

Data Export:

Audience lists from all platforms
Conversion tracking setup documentation
Historical performance data for benchmarking
Customer data for LTV analysis

Technical Setup:

Pixel and conversion API configuration
Attribution tool setup and data connections
Reporting dashboard access
Third-party integration documentation

Week 1-2: Foundation Setting

Day 1: Kickoff and Expectations

Agency Deliverables:

Detailed onboarding timeline with milestones
Team member introductions and specializations
Communication schedule and reporting cadence
Initial questions about your business and goals

Your Responsibilities:

Provide complete access to necessary platforms
Share detailed brand guidelines and creative assets
Explain business goals beyond just ROAS targets
Set realistic expectations for ramp-up period

Account Access and Setup

Platform Access Protocol:

Add agency team members to your Business Manager
Assign appropriate permission levels (admin for specialists, analyst for reporting staff)
Maintain ownership of all pixels, audiences, and historical data
Document all access grants for security purposes

Tracking Implementation:

Audit existing pixel setup and attribution configuration
Implement Conversions API if not already active
Configure server-side tracking for iOS 14.5+ optimization
Test conversion tracking accuracy across all funnels

Competitive and Market Analysis

Industry Landscape:

Competitor analysis and creative intelligence
Market trend identification and seasonal patterns
Platform-specific best practices for your vertical
Regulatory considerations and compliance requirements

Week 3-4: Deep Dive and Strategy Development

Account Audit and Historical Analysis

Performance Review:

Analyze last 12 months of performance data
Identify seasonality patterns and growth opportunities
Evaluate creative fatigue cycles and refresh needs
Assess attribution model accuracy and optimization potential

Creative Asset Audit:

Performance analysis of existing creative library
Angle identification and performance mapping
Brand voice and visual consistency review
Creative production pipeline assessment

Strategic Framework Development

90-Day Growth Plan:

Channel-specific optimization strategies
Creative testing roadmap and production schedule
Budget allocation recommendations
Key performance milestones and success metrics

Testing Methodology:

Statistical significance thresholds for creative tests
Campaign structure optimization plans
Attribution window adjustments for accurate measurement
Incrementality testing framework implementation

Week 5-8: Implementation and Optimization

Campaign Structure Overhaul

Platform Optimization:

Meta: Consolidate ad sets, implement advantage+ where appropriate, optimize for business outcomes
Google: Restructure campaigns by intent, implement Performance Max strategically, optimize for value
TikTok: Test spark ads vs. standard creative, implement automated creative optimization
Email/SMS: Audit flow performance, implement behavioral triggers, optimize send times

Creative Production Ramp-Up

Content Calendar Development:

Weekly creative testing schedule with 8-12 new concepts
Angle diversification across awareness, consideration, and conversion
User-generated content sourcing and optimization
Seasonal campaign planning and asset production

Performance Creative Framework:

Hook testing methodology for video content
Static image optimization for feed and stories
Copy testing frameworks for different audience segments
Creative refresh schedules based on frequency and performance

Attribution and Measurement

Multi-Touch Attribution Setup:

Platform-native attribution vs. third-party tool comparison
Incrementality testing implementation for major channels
Cohort analysis setup for LTV optimization
Business intelligence dashboard configuration

Week 9-12: Scaling and Refinement

Performance Analysis and Optimization

Channel Performance Review:

ROAS improvements by platform and campaign type
Creative performance analysis and winning angle identification
Audience quality assessment and optimization opportunities
Attribution accuracy validation and adjustment

Budget Allocation Optimization:

Shift spend toward incrementally profitable channels
Scale winning campaigns while maintaining efficiency
Test new channel opportunities (CTV, retail media, podcasts)
Implement automated budget management where appropriate

Systematic Improvement Implementation

Creative Testing Acceleration:

Increase testing velocity based on statistical learning
Implement winning angles across all relevant campaigns
Develop creative production pipelines for consistent asset flow
Build creative performance prediction models

Advanced Optimization Techniques:

Implement value-based lookalike audiences
Test advanced bidding strategies (value optimization, cost caps)
Optimize for downstream metrics (LTV, repeat purchase rate)
Implement cross-platform audience suppression and expansion

30-60-90 Day Success Metrics

30-Day Benchmarks

Account Access: 100% platform access transferred
Baseline Established: Historical performance documented
Strategy Finalized: Growth plan approved and implementation started
Creative Pipeline: First wave of new creative assets live
Performance Stability: Maintain current performance while implementing changes

60-Day Targets

ROAS Improvement: 10-20% improvement over baseline
Creative Velocity: 8+ new creative concepts tested weekly
Attribution Accuracy: Discrepancies between platforms resolved
Budget Efficiency: Waste reduction through improved targeting and creative
Channel Expansion: New channel tests initiated (if applicable)

90-Day Goals

Performance Growth: 20-35% improvement in key metrics
Creative Library: Robust library of winning angles documented
Systematic Optimization: Automated rules and optimization frameworks active
Strategic Planning: Q2 strategy developed based on Q1 learnings
Relationship Maturity: Communication rhythm established and expectations aligned

Common Onboarding Pitfalls to Avoid

Mistake #1: Changing Everything Immediately

Problem: Agencies that pause all campaigns and restart from scratch lose valuable historical data and performance momentum.

Solution: Gradual optimization that preserves learning while implementing improvements. Test new approaches alongside existing performance.

Mistake #2: Inadequate Creative Asset Transfer

Problem: Losing access to high-performing creative assets forces agencies to start from zero, extending the learning period unnecessarily.

Solution: Complete creative export with performance data before transitioning. Document winning angles and creative frameworks.

Mistake #3: Attribution Confusion

Problem: Different attribution methodologies between old and new agencies make performance comparison impossible.

Solution: Establish attribution standards upfront. Document both platform and blended performance for accurate benchmarking.

Mistake #4: Unrealistic Timeline Expectations

Problem: Expecting immediate improvements without accounting for platform learning periods and optimization cycles.

Solution: Set realistic 30-60-90 day milestones that account for algorithm adjustment periods and creative testing time.

Mistake #5: Poor Communication Structure

Problem: No established communication cadence leads to misaligned expectations and tactical drift.

Solution: Weekly check-ins, monthly strategic reviews, and quarterly planning sessions with documented agendas and action items.

The ATTN Onboarding Experience

Our onboarding process reflects everything we've learned from 200+ brand transitions:

Week 1: Complete account audit, access setup, and baseline documentation Week 2: Strategic framework development and team integration Week 3-4: Gradual implementation with performance monitoring Week 5-8: Creative acceleration and optimization scaling Week 9-12: Advanced techniques and systematic improvement

Key Differentiators:

Dedicated onboarding specialist (Becca) who manages the entire transition
Platform specialists (Hugo, Stephen, Dennis) involved from day one
No pause-and-restart approaches that lose momentum
Creative asset preservation and performance documentation
Transparent reporting that shows platform vs. blended attribution

Onboarding Checklist for Brands

Pre-Start (2 weeks before):

[ ] Export all creative assets with performance data
[ ] Document current attribution setup and conversion tracking
[ ] Prepare brand guidelines and product catalog
[ ] Set up Business Manager account structure
[ ] Identify internal stakeholders and communication preferences

Week 1:

[ ] Complete platform access setup
[ ] Conduct kickoff call with full teams
[ ] Review historical performance and benchmarks
[ ] Audit creative assets and brand guidelines
[ ] Establish communication cadence and reporting schedule

Week 2-4:

[ ] Implement tracking and attribution improvements
[ ] Begin strategic campaign optimization
[ ] Launch initial creative tests
[ ] Set up reporting dashboards and KPI tracking
[ ] Review and approve 90-day growth plan

Month 2-3:

[ ] Scale successful optimizations across campaigns
[ ] Accelerate creative testing velocity
[ ] Implement advanced optimization techniques
[ ] Evaluate new channel opportunities
[ ] Plan strategic initiatives for next quarter

Setting Long-Term Success Patterns

The best agency relationships evolve beyond tactical execution to strategic partnership. Use the onboarding period to establish:

Communication Excellence: Regular check-ins, proactive recommendations, transparent reporting, and strategic planning sessions.

Performance Accountability: Clear KPIs, regular performance reviews, honest assessment of what's working and what isn't.

Creative Collaboration: Efficient asset production, angle development, and performance feedback loops.

Strategic Alignment: Business goal understanding, growth planning, and market opportunity identification.

Great onboarding creates the foundation for years of profitable growth. Poor onboarding creates friction that never fully resolves.

Invest the time upfront to get it right. Your future performance depends on it.

Additional Resources

Ready to Grow Your Brand?

ATTN Agency helps DTC and e-commerce brands scale profitably through paid media, email, SMS, and more. Whether you're looking to optimize your current strategy or launch something new, we'd love to chat.

Book a Free Strategy Call or Get in Touch to learn how we can help your brand grow.