All the best.....
You need on working to improve your credit score. I can recommend some good Brokers if you contact me. From a practical perspective, most lenders in today's conservative mortgage market, are seeking a minimum score of 620 or so in order to place you in an affordable program.
FHA loans do not look at your credit score, however you must be able to proof that you have a good payment history with several other accounts and that will establish your credit for the loan...and of course enough income coming in.
Contact John Smoley at: email@example.com he is a local mortgage broker who is known for handling difficult loans, let him know I recommended him.
You need to find a good Mortgage broker, who can get all your information and figure out a program for you.