ive got one of those myself. nice cheap little mixer, very pleased with it and easily comprable to my mackie 1604 (sound and feature wise, obviously fewer channels)
to record an amp, you can do it a couple ways. most people prefer to mic the amp because the whole amp, speaker included, is part of a guitarists desired tone. but many folks record direct as well. direct is when you take the signal from the "pre amp out" on the amp (if it has one) and run it to the mixer. you NEVER want to take the power amp signal (i.e. unplug the speaker and take a line from the speaker jack to the mixer) so it really depends on the sound you want.
as for drums, id start out with the less is more philosophy and use that one mixer for the whole band. by limiting the number of mics you can use on drums youll get more experience in how much you can really do with each mic. good learning time. also since youre just going straight to cassette youll have less to worry about when mixing.
when you dont have enough mic inputs on a mixer you have to either buy a mic preamp or go direct. you can pick up cheap but decent mic pres these days for under $200 (presonus and behringer) thatll give you two more mic preamps for the 5th and 6th channel on that mixer. or you can go direct. either use the pre-amp out like i said above or with a "direct box" (or DI). a DI can be had for about $30-50. what it does is bring a guitar or other instrument signal up to a reasonable level to go into a "line in" on the mixer. (line ins are designed for things like keyboards which have a different output than a guitar)
so ... using that mixer for a normal band (guitar, drums, bass vocals, second guitar) id set it up like this:
(the first four channels have mic preamps so you want to use them for the most critical or necessary mic'd instruments)
channel 1 - vocals
channel 2 - bass drum
channel 3 - drum overhead
channel 4 - guitar amp
(channels 5 & 6 are stereo "line" channels, and dont have mic preamps)
channel 5 - second guitar (direct record)
channel 6 - bass (direct record)
if you want another track, cut the drums down to 1 channel and just experiment with mic placement to get the most well rounded kit sound with one mic. it can be done
the manual that comes with that mixer is pretty good. itll show you how to hook up stuff like record decks and reverbs etc.
have fun!!!
