No worries about the questions man. I got scolded, flamed and mocked at when i posted at some other boards when i was a complete n00b, (you could say publicly)
Well, the soundcard will mostly affect compatibility with the computer, latency, and data transfer issues (if its a soundcard only, not an Audio Intercface).
If you already have a mixer, you'd need a recording soundcard like the delta 1010. For laptops, its best to run everything external.
If you want a 3 in one unit, called an Audio interface, which has mic preamsp, convertors and the soundcard itself, you could look at some of the following :
Simpler, Cheaper AIs
-
Maudio Firewire Solo
-Presonus Inspire 1394 Firewire
-
Echo Gina 3G PCI Audio Interface
[These have basic line ins, and are small, portable interfaces]
Upgraded versions
-Maudio 410 Firewire
-Presonus Firebox Firewire
-Emu1820M (2 mic pres, 1/4" I/Os)
[These mostly have 2 mic pres, with extra 1/6" or 1/4" I/Os, mostly with SPDIF and Midi I/Os, with some extra functions. Usually come with softwares, Limited Edition]
More expesnive, More input AIs
-Presonus Firepod (has 8 mic XLRs with pres)
-
Mackie Onyx 400F FireWire Audio Interface (4 mic pres, but they're good and expensive)
[These have more preamps, possible to record drums]
Its up to you though, if you want to get the mixer, get a good soundcard, and not an AI, as you'd be buying what you already have. Maybe try the Delta1010 if you go mixer.