Sorry that you are having trouble. It appears that you do not need a lease to own but maybe an owner financed home.
Typically on a Lease to Own, you are required to put a sizable amount of money down, then at the end of a year you have the option to purchase the house with part of your rent as down payment. The trouble with this consept is that if you can't qualify for a loan (you are saying that your credit is not great) you forfeit all your accumulated down payment plus the original deposit money. In that case, you would have been better off to just rent something.
You could find someone who owns a house and will owner finance it for some money down and actually give you a deed with a deed of trust lein on it. I actually know some of these in south Jackson.
The best solution really is to find a program like NACA or some lenders who will help you make a plan to get your credit in order for purchasing. That way, you can actually have a choice of a house which you love and want to live in... and not just take whatever house someone will work with you on.