#1
So Say I buy this:

http://pro-audio.musiciansfriend.com/product/Behringer-XENYX-X1222USB-USB-Mixer-with-Effects?sku=485371&src=3WFRWXX&ZYXSEM=0&CAWELAID=469482363

What else (other than obvious things mics, cables, guitar, amp, etc etc.) do I need to get this thing hooked up to my computer to record with?

I hear something about a USB Audio interface? But I don't know really. I'm quite noobish
#2
im also noobish, but i wouldnt get anything with USB because of the latency
#3
I just tried plugging my band's PA mixer into my computer via Microphone slot and RCA-3mm jack using the Soundcard on my computer as an interface, yeah, that sounded like pure shit.

I can get a better sound from my rockband mic than I can doing it that way.