Here's the checklist and a video explaining the basics.

A good project brief talks about these core 4 elements

1. Your pitch
   - What you do
   - What you sell
   - Current situation & goals
2. Your assets
   - List of existing and new assets
   - Written content
   - Design guidelines
3. Your tools
   - List of your tools
   - Requirements
   - Test plan
4. Project Phases
    For each phase:
   - The type of person & the work
   - Time frame
   - Budget & ROI