I agree with the other posts, rent to own is not typically a great option.
if you are renting - find a rental that works for you, preferably one that is cheap enough to allow you to save money so you can get into a position to buy down the road.
when you are ready and able, find a house to purchase that works for you. The sooner the better to take advantage of historic low interest rates and record low housing prices.
I recommend you talk to a lender now. Have a professional review your credit with you and give you direction to get into a position to purchase a home in the future if that is your goal. there is no cost or obligation to have a lender pull your credit and review it with you. also hud has resources available, go on their website or other websites - heck, google "how to budget to purchase a home" for tools.
Best of luck.