I recommend Aislinn Phelan with Keller Williams in Beaumont.  

I can recommend Ryan Luthi and Lauren Peterson at Fulton, Jordan Moorhead at Keller Williams and Alyssa Strom at Side by Side. 

I recommend a lot to check out the book "The One Thing" by Gary Keller.  

I just purchased The Millionaire Real Estate Investor by Gary Keller which isn't specific to MFR, but was recommended as a good starting book.

Brian Alfi at Windermere and Dan Keller at New American lending!

If you refer to Gary Keller's findings in the Millionaire Real Estate Investor the average debt to equity ratio among all of the real estate investors he and Jay Papasan interviewed was somewhere between 50-60%.There are certainly investors who have all-cash portfolios and those on the other end of the spectrum who are leveraged up to their eyeballs, but according to the research done at that time the investors who would be considered "mature, established' investors tend to float around that mark. 

@Hank Keller That's an interesting idea, I'm going to look more into it. 

"The Richest Man In Babylon" is a classic, but the one that helped me most in the beginning was the "Millionaire Real Estate Investor" by Gary Keller.

I'm a buyer's agent with the Bhatla-Usab Group @ Keller Williams of Princeton.

If you are interested in a Buy and Hold approach, "The Millionaire Real Estate Investor" by Gary Keller is a good book.