Google Site information from Liane St. Laurent:
Due to the number of non-legitimate Sites being created in the past, the IT department has disabled the student account ability to create a Site. However, teachers are able to create Sites, and once a Site is created, a student can be added as owner and he or she can work on it.
How many students? A teacher can create a small number manually or if there is a bigger group of kids a teacher can use Site Maestro to create a batch of sites from a spreadsheet: http://cloudlab.newvisions.org/add-ons/sitemaestro
Alternatively, students can create their own Google accounts and access the Sites functionality from there.