I like to to program a kick on pad 1, open hi-hat or cymbal w/decay assigned on pad 5, a snare on pad 2 and other percussion sounds on pad 6. I then tend to assign other drum sounds into pads 3,4,7, & 8 for layering over the first quadrant of pads. If I chop up a melody (piano, horns whatever) into 8 parts with zone, Ill program into pads 9-16 and play them back in whatever order. If the chops take up more than 8 pads, Ill hit the next pad bank.
Seasinz is dead on tho, whatever you find comfortable. The mpc doesnt come with preprogrammed sounds. Just set it up how you want the beat to feel (if that makes any sense.)
If you want a suggestion straight from akai, look at the labels above each pad on the mpc3000. Each pad is labelled with a suggested drum sound.