You'll need a decent way of importing your sounds to your computer (soundcard or sound interface) There are several different kinds to choose from.
PCI - Goes inside your computer case (tower) directly plugs into the mother board.
http://www.musiciansfriend.com/rec/navigation?page=1&N=100001+309132&Ns=P_Price|0
USB - Plugs into a USB port on your computer or Laptop
http://www.musiciansfriend.com/rec/navigation?page=1&N=100001+309115&Ns=P_Price|0
Firewire - Plugs into a Firewire port on your computer or Laptop
http://www.musiciansfriend.com/rec/navigation?page=1&N=100001+309117&Ns=P_Price|0
Then, depending on how you want to record it, do you want to setup microphones on your guitar amp? Then you'll need a good mic or two and a decent preamp that will be able to accomodate however many mics you are planning on using. You can do a search on this site on all of these topics.
If you want to plug in direct, you can find a good DI box, Line 6 makes a few nice interfaces as well.
You'll also need software, I personally use Cakewalk Sonar Homestudio V4.0. So obviously that is all I can really comment on, you'll want to do some investigation on software as well. A word to the wise, posting things like "what is the best <insert hardware question here> won't get you very far, it will require effort on your part, but if you aren't willing to take the time to look into things yourself, you'll have a hardtime finding someone around here to hold your hand through it. Not saying that's what you're doing, just offering some friendly advice.
