The Texas Real Estate Commission (TREC) provides standardized contract forms for residential sales. A For Sale By Owner contract Texas must include: 1.The Purchase Price, 2. Name the parties in the contract. How do I fill this out? This FSBO paperwork is needed as soon as you accept an offer, so it's useful to have a purchase agreement onhand that you can fill out quickly. Erica Parker - Queen of Real Estate•6.3K views. Please fill out my quick real estate sellers request form and tell me about your property.