There are tons of examples of these container homes online plus info about the conversion process.

You can also check their reviews online at Google, Facebook, or Yelp.

You don't even need an LLC for one mortgaged property. 

The QuickBooks Online Plus subscription could be a great option for you.

So once you get to 5 units, most investors end up on the commercial mortgage side of a bank.And as he notes, from a brokerage standpoint, in my market, I see most 8 units or less exclusively on the MLS.  8-20ish units are a mix of MLS and Loopnet/Brokerage sites.  20+ units are almost exclusively listed by brokers that specialize in multi-family and you will not see their names on yard signs anywhere.  

Downpayment came from proceeds of a land flip bought at an online tax auction (**********).

To recap: Be extremely cautious with flat fee MLS sites that only refer business to other agents.Bonus PointsYou should also consider the ease of use of the flat fee MLS listing provider, for example, can you complete everything online?

The cash flow left over after reserves, my mortgage, and other expenses is the cash flow that I "pay" myself / my business. 

You can also speak with a lender to see what you need to do to qualify for a mortgage if buying a house down there is one of your goals. 

I have found a couple online and I am curious if there are other "harder to find about ones".