Yeah, unless there's a reason why you need to record the whole band at once, it's much easier to build it up one track at a time
In retrospect, I hate the guy who answers the question with "you shouldn't do it that way".
So... "You shouldn't do it that way, but if you're going to anyway..."
Drums are probably the hardest part of what you're trying to accomplish. If you dedicate 6 channels to the drums but don't absolutely know what you're doing, you're going to get better results using drum replacement. (i.e. you'll mic each tom, which will then probably sound like garbage, so you'll replace each hit with a sample)
Rather than trying to wrangle 6 mics on the kit, try 2 or 4. Spend an entire day getting the drum kit to sound the best it can in the best-sounding room you can. Then set up 2 mics as overheads (try googling "recorderman" and other OH techniques) or room mics (Place them perpendicular to each other in the single best-sounding location in the room; of course, this will only really work if the drums are in a separate room from everyone else). You may also want to mic the kick and the snare separately. Fortunately, that still keeps you below the 8-inputs in your average consumer interface.
Record some samples of the drums; get those sounding the best they can.
Then bring in the rest of the band.
Have the rest of the band be as quiet and isolated as possible! If the guitarist cranks himself up to be heard over the drums, every mic is going to start picking up that guitarist. If you don't have isolation, you can't mix much. Then spend as much time as you need to with each instrument to get it sounding right in your recording.
Plan on redubbing the vocals anyway. I doubt they'll sound great.