How To Write Propose . Think about groups that you belong to and problems that those groups have. Ideally, a proposal should be fewer than 10 pages for transactional proposals below $10,000, and never more than 50 pages.”. Proposal Email Sample scrumps from scrumpscupcakes.com For your plans or propositions to be authorized, you need to convey them in a straightforward, brief and captivating way. How to write an event proposal. Composing a story can show the potential.