I am a school administrator. I want to know if I can register my school, add my teachers and have each teacher invite their students? I can only see the option for eah teacher to register individually.
There is no hierarchical structure that would allow that. I suggest you have your teachers each create their classrooms, but name it however you would like to keep it consistent. Make yourself a spreadsheet, and then add yourself (or some fake "everyman" whose password you give to your staff) as a student in each class, if you want to be connected to what everyone is doing.
Hope this helps!
And by the way, it is very nice to see an Administrator supporting language acquisition!