Welcome to Keller. I can't tell you that what you seek won't work, but you should not hold your breath! First, one has to wonder why you want to rent for a time and then buy the same house. Is it that you can't qualify for a loan to buy the house right now? Is something major going to change in your life in the next year?
Most owners who want to sell a house, do not wish to rent it to a family who may cause damage to it before it can be sold. Most landlords who want to rent a house, do not want to sell it because it is a money-making investment. And most tenants who rent a house, find every thing wrong with it, and then do not want to buy it. --And when would you agree on the sales price??
I don't know where you are coming from, (although your return says Grapevine), but in this part of Texas the fair market rent on a house is a LOT more than "someone's mortgage payment." So I can't picture anyone just renting out their house for the amount of the mortgage.
My suggestion would be to check with a good loan offier and find out how long it will be before you are qualified to get a loan to buy a house. Then you will know how long you need to rent a house. It may be in your best interest to keep the two separate. The Texas Real Estate Commission will not allow any agent to even write a "lease/purchase" contract because the situation is so fraught with pitfalls. Too many lawsuits. Too many people who have lost all their money that they put down.
If you'd like to lease a house in Keller, call me. If you want to buy a house in Keller, call me. But I doubt that anyone will let you take over their mortgage payments.
Good luck to you!
ULTRA Real Estate Services