Micehelle most rent to own deals are not listed as such, they are homes listed for sale in which the seller has to move right away and the home has not sold. The 2 most common ways are getting a buyer broker who can do teh reserach for you checking to see if any sellers are able to offer a lease purchase. The 2nd option is you contacting many different leading listing ganets in your area to see if any of their sellers would or could do a lease purchase.
Either way your first step should be to get prequailified, you need to know what price range you can afford, what teh monthly paymeht they suggest and how liong before you can get a mortgage and hwat you will need for saving to complete the purchase
Please see my blog for a full list of tips and advice for renting to own a home.