My name is Kameron, licensed here in Kansas & Missouri with Keller Willaims Diamond Partners.

Gary Keller, the world's most famous real estate broker, and founder of Keller Williams, says the same thing in his wonderful book The One Thing.

First read The Millionaire Real Estate Investor by Gary Keller.

Keller Williams is an awesome company to work for.  

I'm a salesperson in Ma and I'm affiliated with Keller Williams Realty.  

A full time broker like Keller Williams, C21, Remax, etc or small mom and pop near you?

These brokerages are typically less involved with their agents (don't provide training, luncheons, parties, business cards, etc.) but don't require a huge commission split like Keller Williams does with their new agents (65%KW / 35%YOU), although KWs does offer a lot of training, but of course you have to pay for the training as well. 

Choosing Century 21 over Keller Williams is not going to make or break your career.

I might consider if you should go with an agency that really trains folks how to do the job, such as Keller Williams.

If you do get one, try to be part of brokerage that has a focus on investors like Keller Williams.Avoid paying for expensive branded educational products.