What Do You Need to Make an Offer on a House? Today we are going to talk about how to fill out a trek one to four offer.Your offer's sale price is the most important figure in the letter. Research comparable homes in the area to ensure your price is competitive. Work with your agent to submit a written offer based on local market value, specifying how and when the steps in the purchase will happen. To help you figure it all out with minimal hassle, this 3minute guide to offer letters shares insightful answers and info for homebuyers. Have A Solid Approval from a Lender Obtaining an approval letter from a mortgage lender should be your first step in the homebuying process. A real estate offer letter outlines the terms for a real estate purchase.