#1
I'm going to buy some recording equipment tonight.

I plan on getting the mbox 2, and running it through my pc
I'll mainly be doing guitars and vocals, so I'll get a mic too.

I'm just wondering if there's anything else I'll need.
cables, programs, cords, i dnno.

What do i need to plug the box into my pc? will it have it?
I'm sure i can get these answers at the store, but I want to know what I';m getting into before dishing out about $400
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#2
With the Mbox, you get everything you need right out of the box to start recording. Have you taken a look at one of these bundles yet: http://pro-audio.musiciansfriend.com/product/Digidesign-Mbox-2-Factory-Studio-Bundle?sku=583511

This comes with a solid pair of studio monitors & a pretty good condenser mic for just a little more than what just an Mbox will cost. Also, if you plan on micing a guitar cab, I would suggest getting either a Sennheiser e609 or a Shure SM57.
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