A Florida residential purchase agreement outlines the terms of a transaction between the seller of residential property and the buyer. 1. Get the right form.First, you will be needing the appropriate form for your state and type of purchase. This document represents the most important step in purchasing a home, as the details of this agreement dictate the terms of your purchase. A Florida real estate purchase agreement is a written notice or statement notifying potential buyers and sellers of important aspects of the sale agreement. There will be many different documents that require your signature before you can complete the purchase of your new home. 1. Gather all necessary information about the property. To write an offer, you fill in the blanks. In legalese, these are called contingencies that are written in your real estate contract.