This is really stupid, but any help would be greatly appreciated.
I recently downloaded Audacity but I don't know how to get the music from my guitar to the program. I assume I need some sort of mic but all I have is a mic that plugs into amps.
Just buy an adapter. Plug your mic into one end and the other into your computer. Its small and costs less than 10 bucks. You can get them at Future Shop or Best Buy and places like that.

Just wondering, are there any mics that plug directly into your computer?
read the sticky posts at the top of the page and view the videos if you want.
That should get you started well enough.
Then theres Tweaks recording guide. (input "tweaks guide" into the URL box in your browser and hit enter).

No question is stupid. Your just new to it all and everyones got to start somewhere.