Right, let me explain the qualification process. I was talking from a 50,000 foot view, but I'd be happy to be granular, because I certainly don't want anyone to perceive what I do as predatory (again, @Bill Gulley, you can address me directly rather than passive aggressively).
For any potential buyers you come across, make sure that you screen them through a company called www.landlordstation.com (they are owned by transunion, so they are extremely reputable). You will get employment verification, TU credit score, any accounts they are delinquent on or in collections, and criminal history. If they look like they won't have the ability to actually qualify for financing based on what you see, don't move forward with them. The point in this business is to help people (sellers, and buyers), not to take advantage of people.
If they have repairable credit (small amount of accounts in collections with small amounts), you can also help them rebuild their credit using www.lexingtonlaw.com (in fact, you can actually gain an affiliate relationship with them if you choose), but the only way this works is for your clients to pay off anything in collections, and pay any judgements they have as well (because anyone with a judgement won't be able to actually get a loan down along the line). With $0 balances on collection accounts, lexington law can actually challenge those tradelines with the bureaus, and almost 99% of the time, they can get them removed from their credit report (I know this, because I've personally used them myself).
There are some lending programs out there that go as low as 580 with a credit score, but most need a 620. It would be helpful to call a local mortgage broker and seek their advice, and help your client out by introducing the two. The second component of financing is the debt to income ratio, which the credit score also effects. On the safe side, try to keep the expected monthly mortgage and all other combined monthly debt obligations to below 1/3 of their monthly take home pay).
At the end of the day, if you put all of these components in place, you will find a strong buyer. HOWEVER, if they decide to back out after everything you do, you can't stop that... and you need to make sure your lease option buyers know full well that their option consideration is non-refundable up front.
Does that clear things up, @Bill Gulley?