The most fundamental question is whether you are going to record one by one to a click track (the way virtually all commercial records are cut) or if you are going to try to record in a "live" situation (perhaps with the bass guitar in a separate room with headphones on), if so what you are going to do with a full drum kit (verrrrry loud!!!) to try to get any sort of separation and whether you are going to use "live " vocals as a guide track and then overdub or doubletrack.

It affects the size of the room a lot!

Oh by the way Mackie have just announced a very pretty virtual 24-track sampling at up to 96 for a mere £4000 in the UK.