Right now, they are mainly concerned with total square footage. Although there are many good suggestions in previous posts, details aren't necessarily important now (from your superintendent's perspective.) Of course get all of that together and keep in a file. After the bond passes, the conversations change to details and you can share that information then. Start gathering information about enrollment - past, present, and future projections. This will help you the most as far as the square footage answers.
This is an exciting (and scary time). Embrace the process, and take time to go look at some band halls!