Real Estate Law
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You need a contract for deed, which is basically a rent-to-own agreement for real estate. There are samples online, such as the one at this link: http://texascbar.org/legal-library/toc/real-estate/contracts-for-deed/
You can also hire a local lawyer to draft you something that would be specific to your issues, instead of a generic form.
So, you should work out your payment terms with the buyer and then put together an agreement that sets this out.