Answer the eleven questions and keep it to one page. When you save, you get a link to send. People can comment on the part they mean and approve it with their name.
This is your edit link. Keep it to yourself, since anyone with it can change the brief. Keep this link to return and make changes.
Using this with a whole team? I'm thinking about team workspaces: your logo on every brief, private team briefs and the full approval history in one place, for $15 a month.
Rather not start from a blank page? Start from a filled-in example and change it.