Just so you all know, I'm reading every single comment and clicking every link. Thank you so much for all of the advice guys!
If anyone has any additional help, please don't hesitate to say something, I need it!

Hey everyone!

First post, here I go.

Some background information on me. My name is Slim, and I've been on the CS competitive scene on and off since Source, and recently I spend most of my time in GO. I've reached the upper end of the skill spectrum in Counter Strike: Global Offensive (LEM-Supreme), and I have several friends that play both CS and TF2.

Now, through my TF2 friends, I've heard that the implementation of a matchmaking system into TF2 is immanent. I've fiddled with the game on and off in pub servers, and it's never really been as compelling as other shooters.
With a matchmaking system, several friends and I plan on getting into TF2 on a more intimate basis.

Here's where I need help.
I've got no idea what to do in TF2 to practice or train, nor do I know how to properly play the game from a competitive standpoint. Are there PUG services that take the games competition more seriously?

What should I do to prepare for TF2 MM, and how to I get into the competitive scene of the game?
I want to play this game more, and would love any advice from veteran players.

Thanks a bunch!
Slim