How do you get into acting, especially comedy?

I've been told (by friends as well as people I don't know very well) that I would be good in movies, especially comedy movies. I have numerous impressions that I do well, as well as some that I am working on. I'll provide a list at the bottom. I'm located in Springfield, MO, so I don't exactly have Hollywood next door. I don't know how or where to begin. I know I'm good at acting, and it seems like something I would like to do. Also, any tips for if I do get a part in something?

As promised, here are my impressions.

Good impressions:

-Beavis/Cornholio

-Butthead

-Mr. Buzzcut

-Mr. Anderson

-Arnold Schwarzenegger (I've had a TON of fun with this one)

-Sean Connery

-Gordon Ramsay

-Philip Seymour Hoffman as "Capote"

-Tom Hanks in "Forrest Gump"

-Stitch

-Heavy from TF2

-Soldier from TF2

-Spy from TF2

-Medic from TF2

-Bill Clinton

-Dana Carvey as Church Lady

-Yoda

-Jigsaw

-Eric Cartman

-Noel Clark

-Jimmy Stewart

-British Accent

-Australian Accent

-German Accent

-Russian Accent

Impressions that I can do but still need work:

-Barack Obama

-Chris Eccleston

-David Tennant

-A Dalek

-Don LaFontaine

-King Leonidas

-Patrick Warburton

-George W. Bush

-Bill Nighy

-Sniper from TF2

-Engineer from TF2

-Demoman from TF2

-Scout from TF2

-Bill Murray

-Sylvester Stallone

-Terry Crews

-Tom Cruise

-Donald Duck (dead serious)

-Mickey Mouse

-Goofy

-Pete

-Jim Carrey

-Harvey Fierstein

-Jeff Goldblum

And that just about covers it. However, I'm always looking for new unusual voices to try. If you have any suggestions, please LET ME KNOW.