I'm not licenced in Florida yet, but with your scores you should qualify for a FHA loan. The lender usually throws out you high and low scores and uses your middle score. For you that would be the 640, which is about the minimue that most of them want to work with. They don't like to see you maxing out your credit cards either. Sometime the quick fix for that is to ask your credit card company to increase your limit. Just be mindful of not using that extra credit.
First thing you want to do is contact a lender. They will pull your credit, and can discuss with you your debt to income ration and if you have anything in reserves. It not only about how nuch you make, but how much of it do you keep.
Normally the down payment is 3 1/2% of the sales price of the house. However, if you find a HUD home to purchase then the down payment is reduced to only $100.00. Check out their website at http://www.HudHomeStore.com
and select your state.
I hope that helps you.