how do I speak "lawyer?" to get an owner finance contract

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I have a lady highly motivated to get her own place, however, she is disabled and lives off a tiny check. She came to me saying she desperately wants to own her own house but can only pay less than $100/mo and she let me know her credit is shot. It will be my job to find her someone willing to owner finance their home to her. So, I need a letter of intent to a home owner willing to finance but my lawyer is confused with my investor talk. How do I ask my lawyer, in legal terms, what kind of contract I need? on top of that, since this lady is broke, how can I make a profit off this deal?