Since its your first investment, understand it doesn't need to be a home run.  

Lack of understanding and a good CPA IMO...Work w/ a firm that specializes in working with corporations...not some old guy that works out of his house...

From my understanding, you can take a FHA loan out on a fourplex or less (ie triplex, duplex, SFH).

The broker you are supervised by, as well as the brokerage firm holding your license, would be similarly exposed, which is why many brokers will not hold the license of agents engaged in wholesaling.It is important to know and understand the legal landscape before undertaking any endeavor.  

I understand that ANY rental investment is going to be more work than I can imagine right now, but I have done some incredible things in the past, and, for my 3 daughters, have no doubt that I can and will do whatever it takes to make it successful.

Where is the best information I can get quickly to understand short sales ....

I'm not a realtor, however, I'm to understand there are quite a few professional expenses you'd have to pay to hang your license with a broker.  

Many of these are not particularly well written but you may learn something by reading and trying to understand a few. 

Right now I am talking with a CPA to better understand what type of entity I should be starting and how to structure my business. 

I can understand that.