Get more storage space than you think you will ever need. National standards state 55 square feet per student in the classroom. NAEA has a facilities design pamphlet. It's for administrators and designers (who never look at it).
Computers? Will you have thewm? Teacher space? Are you networked? VENTILATION make it you're #1 priority. This is your only time tio get it right. Ventilate at the source of the fumes, not above the student'd heads.
Kodak has darkroom designs. Call their hot line.