The Texas Real Estate Commission (TREC) provides standardized contract forms for residential sales. Knowing the basic forms needed for an FSBO sale in Texas, such as the purchase contract and earnest money agreement, is essential.The document is called the Registration Agreement Between Broker and Owner. Let's dive into some of the FSBO paperwork that will be necessary when legally selling a house without an agent's help. Elements of a FBSO Contract: 1. Name the parties in the contract. Texas requires those selling FSBO to fill out and file many documents and forms. Several of these documents are legally binding agreements.