I am far from a n00b when it comes to games. I have competed in many tournaments before on both Xbox and Xbox 360. The games I have competed in are Halo 2 and Gears of War. One of the most notable tournaments I have competed in was last year's MLG Finals in Vegas.
 
My question to you is how do I get involved in PC Gaming? I can't seem to find any tournaments or qualifiers or anything. Does anyone have any suggestions or tips on how I can get involved?

Checked out CAL or CPL?  I play TWL with my clan in bf2, not sure how xbox games gets tourneys going.  Check those sites out.  What did you do for GoW and h2, 1v1 or clans?

you might wanna try armed assault which is the next big thing

I donno if ArmedA is the best example...Really high learning curve.
but if its tournaments..isnt Quake wars the next big thing?

Quake wars definately is the next big thing along with Crysis. For your tournament problems ill give u links to the CAL website and the TWL website.
When you join a clan u sign up on one of them and play matches which ur clan will organize.
 
You should wait until june to get quake wars or get bf2 now but bf2 is going to the **** hole so i wouldnt go with that. Here are the links to TWL and CAL:
 
CAL:
 
http://www.caleague.com/
 
 
TWL
 
http://www.teamwarfare.com/
 
 
I would wait for quake wars here are the system requirements:
 
http://quake.freakygaming.com/pc/a [...] ments.html

Both. Halo was 1v1 and GoW was clan.

IMO TWL is a joke..go check out CAL or CPL(need to be 18 or over or something for CPL). If your going to go into competitive gaming just check out which games CPL or CAL support then pick them up and start playing, join a good team, and then hopefully you'll be competing.