I've received my GA salesperson license and I'm currently working under  Century 21 Town & Country of Albany, GA.

Suddenly as I realize the rocks have been here thousands of years, the stream many centuries, and I am just passing through like every man before me, it seems easier to put things into perspective and figure out what is important to me. 

Find one that is not main stream, so not century 21, cold well banker, and etc.

utm_source=twitterfeed&utm_medium=twitterhttp://www.npr.org/blogs/money/2012/07/03/156222428/episode-384-the-little-lie-that-rocked-the-bankshttp://www.bloomberg.com/news/2012-02-15/libor-investigation-said-to-expose-collusion-lack-of-internal-controls.htmlhttp://www.thenation.com/article/168751/libor-crime-century#

If I start working at a real estate company such as century 21, will it help me gain experience to start my real estate investing?

If you want a nice family home in a working class neighborhood, that isn't expensive, they don't go to Century 21 for that national MLS system, they go to the mom and pop brokerages.

After my experience with a regional brokerage (50/50 commission split) and a local brokerage (30/70 commission split), I went with Century 21(20/80 commission split).  

All you need is to start with one house...and just keep repeating the process.Albert Einstein once said that "The greatest invention of the 20th century was compound interest".  

All I care about as "landlord" (is there a better 21st century term for this position?)

One is because of the character of the homes in the neighborhood many of which were built around the turn of the century.