Gear: 86' BC Rich Warlock Guitar & Vox DA15 Amp

Umm, what would be best for recording with a $75-$100 price range?

Should I just get a microphone, or something that plugs my guitar into the computer?

Also, my amp has a Line/Phone plug, so would I be able to plug my amp into my computer?

P.S. I'll get into brands later.