Hi Brian,
If your District already has a GAFE domain, there is no need to
purchase an additional domain. Your classroom can be setup as an
organizational unit (OU). It will inherit all services from the root,
which can either be allowed or turned off. Whenever your class creates
anything (Doc, Presentation, Site, etc.) only share it with who ever
you want to see it.
Do you also have a Moodle site? If so, someone in the district could
set up a moodle/ Google integration. Students could log into the class
moodle, click one button and be in their GAFE account without signing
in again. When they exit their GAFE account, they would be back in
Moodle.
If you don't have Moodle or any other LMS, think about using Blogger
or a Google Site for your class. Students log into the chromebooks, go
to the class blog or site, and get busy with the morning activities
while the teacher takes care of the morning business (attendance).
Suzanne Dreyer
Instructional Technologist