Start with a decision, not decoration
A useful flyer brief names the reader, the decision or action the page should support, and the evidence required before design begins. For this project the audience is people who need to understand one offer, event or announcement quickly. The working objective is to communicate one main message and one next action at a glance. Write those two statements at the top of the brief and test every proposed section against them. Material that does not help the reader understand, trust or act should be removed, shortened or placed in a secondary channel.