At first decide who will act and who will be responsible for the decoration, the costumes, the advertising (if you need something like that), the music etc. Motivate them to produce ideas It is better everyone to have a specific role and very important to cooperate with each other in small groups.

Then see your funds, how much you can spend for the performances and how you can get things that you are going to need, cooperate with the kids about it (for ex. someone may be capable of finding a cheap way to make the costumes…).

Make a list of the things that you are going to need.

Make a schedule of your proves after giving the roles.

I hope you understand my english…