Rent to own is almost always better for the landlord than the renters. The landlord will determine an amount for rent, let's say $1000. Then he adds an option fee per month, let's say $100 and this option money he puts towards your closing costs in a year when you agree to buy the house for let's say $200,000. He will also ask for another fee to hold as a deposit, let's say $300, for when you buy the house. If, in a year, you do not buy the house then he keeps the option fee and deposit which would be $1500. Since he is offering owner financing to buy it he will act as the bank in a year when you agree to buy it at the price you decided on today ($200,000) and he will use the $1500 as the down payment. He will want 10-20% as a down payment ($2-4k) and you will make monthly payments at an interest rate he picks, let's say 8% when todays rates are under 5%, to him as plays like the bank and if you can't pay he takes the house back and does the same thing to the next people he sucks in to his scheme.
My suggestion is for you to rent, and buy when you can and don't get sucked into the rent to buy train wreck.