Plan out how much you'd like to spend & borrow, and speak to a lender to determine how much income you need to qualify.
Amend your 2012 taxes and claim the amount of income you need, plus a little cushion. DTI's are going down to 43% 1/10/14, unless you get a DU approval for more. That could be difficult with limited credit history, but I don't know if you have 3 scores or what your scores are.
Claim enough income for 2013 too. It would be best to have a CPA or tax preparer file both returns, as you'll need a CPA letter to verify that you've been self employed for the past two years, unless you have a business license for your city.
Order a tax transcript to verify that your returns have been processed. You can call the IRS 1-800 number and order it over the phone. It is an automated system.
Since you don't own any property under your name, why not get a 4-plex owner occupied with an FHA loan? It will be a low down payment and they can work with non-traditional credit history such as a cell phone payment, or other bills you've paid consistently over the last 12 months and can document. I know this may be hard to come up with accounts having lived at home, but try to think of a few.
The real downside of FHA is the upfront and monthly mortgage insurance, but you can always refi to conventional after you've built up your credit.
If you still cannot qualify on your own, hopefully your Dad will agree to be on the loan with you as a non-occupant co-borrower.