Hey i've been thinkin' about getting into racing go-karts. I mean serious racing. Has anyone done any kind of go-kart racing before or have any knowledge on getting started and what kind of kart to get?

No, but I'm on a project team designing an electric go-kart. Should be fun.
Don't know much about racing them, sorry.

There's a place near me that does racing. http://www.f1boston.com/

They have leagues and such. I've been a lot, but nothing serious. There are some very serious people there though.