Rent-to-own is a horrible, horrible idea for the buyer. They homes are usually in horrible condition because the seller can't sell any other way. Renters pay a surcharge (above market rent) and you lose your money and deposit if you decide not to buy the house, or if you can't qualify for a loan. Seller hope that you will violate the terms of the agreement so that they can resell the house to the next sucker.
I strongly suggest that you continue to rent until you can qualify for a traditional mortgage; then go shopping for a home. Put the money that you would have spent on the surcharge into a savings account. Fix your credit. And before long you'll have a home of your own.
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