Mixit,
you will need a mixer in order to connect the microphones to the HD24 (btw, how much is that).
not just a regular mixer, you need something which is going to output at least 8 channels for drum recording. if you're intending to record a whole live gig of a band, you're gonna need to think how you're going to send the tracks to the HD24. correct me if im wrong, but the HD24 has no XLR sockets or pre's. im sure it's a standalone recorder.
if you get a small desk where you can output say 8 channels at once, you may need to submix a few things, such as drums.
it could be...
Channel 1: Bass Drum
Channel 2: Snare
Channel 3: Drum Submix (without BD and Snare mics!!)
Channel 4: Bass Guitar DI
Channel 5: Guitar #1
Channel 6: Guitar #2
Channel 7: Vocals
Channel 8: Backing Vocals.
something like that could be done, allthough you dont have the flexibility of recording a lot of tracks at once. you could look into an AD convertor. im sure the HD24 has adat ins. you could get a box which converts 8 analog ins to an adat connection, but again, you have to have a mixer to provide the 8 ins. you cant just plug the mics in.
regarding mic positioning. you will *hear* it. after recording/mixing for a while, you will understand what to look out for.
if you micd up a bass guitar amp which was right next to the bass drum, you would have bass drum all over the bass guitar mic. when you put those faders up against each other, you'd notice a lot of bass frequencies would be just lost. also, in terms of bleed, if you want the bass drum to be quiet and the bass guitar loud, you have a problem because the bass drum is also in the bass guitar mic. does this make sense?!
you want to seperate as much as you can in a live situation, for flexibility at mixdown, so you have no cancellations, and if you're applying compression or effects afterwards, you dont want to apply them to more than the desired instrument, do you?....
-Romesh