I just went through the whole process of buying my first property using an FHA loan. The first criteria you will need to meet is that you find a cash flow positive property (many posts on how to analyse this) . Without cash flow you will be constantly struggling to "grow" your business. I did it by getting a duplex that cash flows. I'm adding value by improving the side I live in and raising rents slowly on the other side. By having a positive cash flow property you can save substantial money to put aside for your next purchase down the road.
You certainly are not limited to retail prices. Your mortgage lender could care less how much of a discount you buy for. The better deal you find the better off you will be. The one thing that does have to happen is that the appraisal must be at least what the purchase price is on an FHA loan.
For me, my next step is to buy another 2-4 unit property in a year or two. Saving my cash flow and possibly even refinancing if value goes up enough will create the funding I need.
I hope this helps and good luck!