As such, it’s become the vehicle of choice for lots of people wanting to get involved with real estate.

I have three choices in front of me and I wonder if I can get some feedback on if any of them sound good.1.) 

Lenders are now doing loans as low as $45,000,  however, those $50-$60,000 properties are not my first choice nor what I recommend to a new or unseasoned investor.Most of our investors finance their investments to leverage their investment capital.

If your tenant/buyer goes the distance and pays off the mobile you now have multiple choices.  1) Retain the lot and get monthly lot rents, which can be increased from time to time...cash flow.  2)  Sell the lot to your buyer for payments...cash flow.  3) Have your former buyer vacate and move the mobile after which you can offer the space for rent, for sale or you purchase another mobile and sell as a RTO...cash flow.My experience won't necessarily be your experience...but it will be close.

If so, what sub topics is a good choice to study?

Keep money for the locks because it was the tenants choice not the hand over the keys. 

If you are buying a property with tenants, you can INTEND to live there all you want, but other legal issues, tenants rights, damage construction, tenant induced code violations, etc. can prevent that from actually happening.While you are trying to follow through with your intentions, your current lease may be expiring, leaving you with no other choice but to find another place to live, and that other place may be the purchase of an empty dwelling that you can move into right away. 

The more aggressive you are, the more potential choices there are (and the more conservative, the less).

Now, your choice of down payment does effect your cash flow, as you correctly say.

So, LVP instead of carpet and the least expensive LVP choice at that.