if you wanna take this as a career first of all be prepared, cos financially you're pretty much handling everything.. the mics,recording equipment, soundproofing, guitar,bass,and amps, drums(cymbals,shell,skins) unless you plan to work at a studio that's already been set up.. and besides that, in my opinion, the way you listen to music in audio will not just attend to your special favourite emo/screamo/punk genres, like if you hate certain genres (metal/pop/indie or what), you still gotta record'em as recording requires you to force yourself to appreciate so you can put in effort from your heart hehe..
Diploma Of Audio Engineering courses : SAE (Sch Of Audio Engineering) , FSV (Film Sound Video, ngee ann poly... i think) finish your O levels first..
equipment wise you got some pretty okay stuff, although I've never regarded creative as a recording soundcard. the mixer's good enough too.
with 6 XLR channels, y'know 3 channels - 2 overheads mics. 1 of your mic put on top of your kickdrum aiming at the snare. hopefully should pick up both "kick + snare"
2 channels - lead/rhythm guitars. (but you only got one guitar amp.. hmm)
1 for your screamo vocals (if you're gonna be screaming, watch the volume level)
and bass.. probably line into your bass amp's pre amp then direct line in into the mixer or something.
and if ya got a compressor, plug it into your inserts for your vocals so you can scream all ya want without worrying the vocals overloading badly.
thats all for live recording.. if you wanna multitrack layer (like record drums first then guitars then bass) , you'd probably need to get more mics + mic stands.
so what do you use to record? that? from mixer to tape output L/R -> 1/8 jack -> your creative soundcard -> your recording software?
you got any recording of your band on myspace?