What happens next?

How to write a creative marketing brief 
Gather your team. 
While you can write a creative marketing brief alone, gathering a team of advisors and experts within your company can ensure that you don't miss any important information. By writing the brief together, you'll be able to work simultaneously on different sections and complete the brief in a smaller amount of time.
In addition, you can check over each other's work to guarantee its quality. If you don't know who to include on this team, consider communications, research staff, and any experts on the subject matter of the brief.