When applying for a bad credit mortgage loan, make sure you are current on your existing credit lines. You will want your current credit to be as good as possible.
Also, make sure to include all the income you have. If you have any equity in any stocks or other financial accounts, make sure to mention that to the broker as well.
The more money you can put down on the loan, the more likely it is that you can get approved. FHA loans usually only require 3-5% down. They are also usually open to working with people with credit problems.