You will build skills and experience in acquiring and managing the duplexes that will help you with real estate projects large and small. 

I don’t have multi-res experience in DFW, but I have owned multiple rental sfr’s there from prior to the gfc.In this business, especially now, you may need to kiss a lot of frogs to find your prince/princess, or turn over a lot of rocks, or any other metaphors that you like.

I figure the worst case scenario, I don't sell anything but I gain a very significant amount of experience and knowledge about real estate (I would be surprised if this happen though as I do have a lot of sales experidence).

Whole homes, in my experience, have more vacancy, especially larger homes but the overall dollar amount is higher in most cases.

Anyone with experience in fair housing complaints, please comment.

Yes you can finance a individual condo with a DSCR loan as long as they are both separate properties. 

With your passion for learning, you'll find a wealth of knowledge and experiences shared on the forums.

I’m installing propane Rinaii heaters in 3 buildings where each larger room will have an individual heating unit and each unit has its own meter.

The experience you gain now will benefit you in the long run.

Since I have little experience doing it, I believe it is very important and that would be why I was considering Rent to Retirement.