Turning your team into above average dribblers should be a major goal of your practice schedule. Ultimately, the drills you do in practice should help your players to become more comfortable when they have possession of the ball.
Make sure each player participates in each drill at practice to the fullest, rather than standing around waiting for a "turn." Getting a high number of touches on the ball is at the core of what being comfortable is all about, and if players are waiting on the sidelines they are most definitly not getting any touches.
When players do have to wait, have them juggle as they wait. When they are at home, tell them to practice by dribbling the ball when they are walking around the house and trying to avoid running into furniture It may piss off their mom and dad but it will be for a good cause because it will make them more relaxed handling the ball, especially in game situations in the face of pressure from defenders.
Small-sided games are great for working on ball handling and dribbling skils because players get tons of touches while they are constantly being challenged. 3v3 or 4v4 keep-away is one perfect example of a game drill where players must work on dribbling in strenuous circumstances. Check out my and you will find a few such small sided games.
The most lethal dribblers are born not made but there is always much room for improvement. Take care to run plenty of drills that will improve your player's ball handling skills by giving them ample touches on the ball.
If you are short on , this soccer drill book has all that you will need! It contains 20 pre planned practice designs that are perfect for any volunteer coach.