A For Sale By Owner contract Texas must include: 1. The Purchase Price, 2.This guide includes forms and instructions for a letter and affidavit to request that the court register an outofstate custody order in Texas. Inspectors are free to use or not use a contract. Learn all about the essential paperwork needed for a successful sale on our blog. This guide will walk you through the paperwork for selling a house without a Realtor and various other steps that can give you a leg up. Texas requires those selling FSBO to fill out and file many documents and forms. Several of these documents are legally binding agreements. A Texas seller's disclosure is a document that tells potential buyers about anything (good or bad) that could affect the purchase contract. TREC's forms are public record, so they are available to anyone.