Parts 2 and 3 are Implementation and Rollout. Check out Part 1, Internal Buy-In & Analysis
Part 2: Implementation
Determine what work needs to be done
What does implementation look like? Read (or at least skim) the implementation guide. Determine what you need to do before anyone implements the work.
A common item to figure out for both analytics and feature flag software: what metadata do you need? For example, will you want to analyze (or turn on feature flags) based on user permission? Based on state, or subscription type? Etc.