Since you're self employed the only way to prove your income is by paying your taxes. You need to show your income.
Now that you have taken care of this part, your next step would be to speak with a lender. They can help point you in the right direction.
Once they analyze your debt to income ratio, look at your credit score & history they are best equipped to either approve you for a loan or help you with credit repairs.
Call a few lenders, start with the ones that responded to your question right here on Trulia.