First off, it is worth talking to your local
theatre supplier or contacting a theatre consulting firm as they can be valuable resources.
I think we can probably help you out, but some more details are probably useful. It sounds like you are trying to revamp an existing space that is part of a school, yes? What kind of space is it? What is already in place? Is part of this project a renovation? Is there space for a scene shop? Do you have any existing gear? What is your budget? What do you want to be able to do, what kinds of shows are you producing?
I know those are a lot of questions, but it will help us point you to the most helpful sources.