Here’s a list of source information you may already have that can help you get started collecting what you need to create your plan:
Technical Architecture

• Information Security and Privacy
• User Security and Access Management
• Web Service, ETL, and other Integration Technologies
• Network Topology
• Data Integrity and Latency
• Error Monitoring and Recovery
• System Availability and Response Times

Business Information and Analytics

• Data Strategy—generation and use of data across and between systems
• Master Data Definitions—Customer, Product, Location, Revenue, etc.
• Core APIs and Services
• Analytic Data Stores

Customer Experience

• Definition of a customer and the customer lifecycle
• UI Standards and Brand Personality
• Preference Management and Application
• Relationship Messaging
• Analytics—Imputed Preferences and Predictive Models
• Personalization Guidelines