I received 15% financing from Keller Mortgage.

Without any financial literacy, it tells you how to manage the finances of your properties and business.I'd also recommend Gary Keller's The Millionaire Real Estate Investor because of the book's practical tips.

We are with Keller Williams and have access to all their tech and data that we can share with you too.  

Long & Foster and Keller Williams are probably your best bets on training.

I say all that to say pick a book or two (I like Gary Keller, Ken McElroy and David Greene) and follow what it says, they all say mostly the same thing. 

In general the best way to find real estate agencies in an area is to check with some of the largest operators around the world (for residential that may be Keller Williams, ReMax, Century 21, ERA, and in some areas Sothebys, etc) and in Commercial that is likely CBRE and a few other companies. 

I highly recommend The Millionaire Real Estate Agent by Gary Keller to get you going! 

I've started trying to build a portfolio of SFH in DFW and am noticing that most of the properties that I'm looking at (HEB area, Keller) have doubled in value in a 4 -6 year span which makes me think current prices are not realistic. 

@Ronnie Allison another good recommendation would be The Millionaire Real Estate Investor by Gary Keller.

Keller Williams will have some of the best training.