Part of my job at church is to head up the praise and worship team. It's one of my favorite ministries at the church and I work with some amazing, wonderful people. One of the valuable resources I tapped into when I first started this ministry was this book:
If you are considering a praise team/band and are a bit unsure of what to do or how to make it more effective, this is a great resource. It is loaded with information on everything from rehearsals to spicing up your arrangements. It also includes some great information on modulating between songs. This would be a great resource if you are trying to help some of your students work toward being in a band. It has loads of information applicable to that setting as well.
A great book that I highly recommend.