I'm familiar with these areas and think this is a great way to start investing.Furthermore, I'm interested in concentrating on one particular niche which is buying and holding rental properties.

., which don't require qualifying for a loan, I would concentrate on that.

I would think about buying properties that are at least within a hour of you if that is possible. then you can still get out there if you REALLY need to without booking a flight.I believe the nature of RE ownership is such that you just won't be able to avoid being highly concentrated, in terms of net worth, toward your RE assetts.

Concentrating on <$100k cash, and willing to do some cosmetic stuff.  

Then they use HEPA air scrubbers so that when they take an air sample of your room, it will show a lower concentration of mold spores than before.

I understand that it will differ in each market, but I am trying to get a consensus on where my concentration should be.

Here is a simple tip for your business.Get a salable listing, sell it, tell the world about it and get more because of it.If you concentrate on this, here in a there the investors will follow you.

I know in general the Hispanic population is pretty low but I'm guessing most of them are concentrated in one area. 

I suggest you not concentrate on the seller financing, unless your credit situation dictates it.

Forget about "building a brand" and concentrate on finding buyers and sellers.The Essential Guide to Building a Buyer's ListAt least 99% of your time, effort and money should go toward closing deals.