As far as buying goes, if you are considering a lease option, I did one of these when I was pretty young and didnt know too much but didnt have a down payment, you might want to connect with someone who can look at your financial picture and see how far away you are from being able to purchase or maybe you are more ready than you think. Either way, its good to have a plan. I personally sold a home to buyers who used and FHA 3.5% down first and received a quiet second for the 3.5% down payment through a governement assist program. They can make payments on it or not, it is due in full when sold or refinanced. The buyers needed a little money for the deposit and other costs but we even asked the seller to help them with closing costs. They purchased a home for less out of pocket then first and last would have cost them for a comperable home.
Contact me directly through my trulia profile if I can help with any additional inquires or connect you to a lender.
If this is the only thing you are looking for, get together with your agent and start looking at normal listings. If you see one you like, you can have your agent ask the listing agent/sellers if they would be willing to do an option.