No need to install software, just go to DocHub, and sign up instantly and for free. How to fill out the TREC contract. wgtitle.Learn all about the essential paperwork needed for a successful sale on our blog. A Texas residential purchase agreement outlines the terms and conditions of an offer to purchase real estate. You'll need to fill out or obtain at least 14 documents, including the purchase agreement, closing statement, and bill of sale. Edit, sign, and share texas purchase agreement contract online.