I would have them passing back and forth to begin with, kicking the balls through cones, just kicking into the goal, see how long they can keep the ball airborne, and try stealing it from one another.
There are dozens of excellent dribbling drills, including step overs, pullbacks and juggling (both in place and on a fast run). Players should learn to dribble with both the inside and outside of the foot and should learn to cut to the left and to the right using either foot.
Set up a line on cones with anywhere from 1 yard to 5 yards apart (depending how difficult you want to make it) then have each person go individually, carefully weaving in and out of the cones with the ball.