I've always run tubes in slicks for two reasons. One is the tubes keep them from leaking. Two is the tube makes the sidewall stiffer which is faster and they last longer.

If you do run tubes, you HAVE to make sure the rim doesn't spin inside the tire or it can tear off the valve stem. I've always screwed them to the rim to prevent this from happening. You can also use hi-tack adhesive on the beads when you mount them, but screws are more secure IMO.

Baby powder on the tube when mounting the tire keeps the tube from getting folded up and "lubes" the tube inside the tire to keep it from rubbing.