1. Define module boundaries (app, core, domain, data, presentation, feature).
2. Establish dependency rules (domain should be independent).
3. Implement UseCases in the domain layer.
4. Define repository interfaces in the domain layer and implement them in the data layer.
5. Implement data sources (local and remote).
6. Set up dependency injection (Koin or Hilt).
7. Implement error handling using Result/Try pattern.