Start by choosing the format that matches the work: Creative Brief, Challenge, Casting, Promo / Experiential or Direct Invite.
Then define:
the purpose and creative context;
roles, deliverables or submission requirements;
how many creatives you plan to select;
compensation for each role or selection;
dates, deadline, working times and location;
usage rights, licence, exclusivity and territory;
selection criteria and decision timing;
expenses, travel, equipment and cancellation where relevant;
any genuine hard requirement;
whether access is Public, Closed or Direct.
You can save a draft without paying. Funding happens only when the Invite is ready to go live.
Avoid vague phrases such as “great exposure” in place of compensation. Do not hide a large piece of unpaid speculative work inside the application stage.