Hi,

You didn't mention your budget, as there are so many interfaces available, from under $100 to over $5000.

I suggest you check out the New M-audio Fastrack USB. It is a portable little unit that uses USB. You have both Mic and line inputs, phantom power, direct line use, ASIO 2, and Pro Tools essentials software all for $120.

http://www.sweetwater.com/store/detail/FastTrkUSB2/

Cheap, easy to set up and use, and sounds great. After you really understand your software and recording techniques, you can always upgrade to something more "High End".

I also advise you to check and understand the system requirnments of of your PC prior to installing the unit and software.

Good luck!
Ed