I'm trying to set up a client/server WiFi network in the classroom where I teach filmmaking.

I have a number of iMacs running FCP 7. The server is a Mac Pro running El Capitan. They are all connected via Airport Extreme router. I would like students to work on projects on the iMacs and then store the files they create on the server for retrieval at the next class. I'm not sure of how to do this. Can anyone help? Thanks!