[pierattt]

I've spent upwards of $9k in the last few months on legal fees because I didnt have a written contract with an old business partner.

At the very very least, get a specific list of deliverables, your profit share percentage, and his ownership rights to your code on paper, then get him to sign and date it. Be as explicit about everything as possible. Not being able to afford a lawyer is no excuse for not getting your general agreement on paper.

If he resists, remind him that the paperwork protects him as much as it protects you.