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. Forms are state specific because real estate laws vary significantly from state to state.Learn all about the essential paperwork needed for a successful sale on our blog. Here's what to know about the paperwork for selling a house without a Realtor and more. The minimum requirement for preparing to list your home FSBO is to complete any state or locally required residential real estate sales disclosures. The Texas Real Estate Commission (TREC) provides standardized contract forms for residential sales. How do I fill this out?