Use in K-12 classroom


I teach Computer Science at a high school going 1:1 with chromebooks so I’m investigating cloud based IDES and Cloud 9 is the best I’ve encountered so far. I was looking through the ToS and saw that users must be of age to enter into a contract which many of my students would not be. I’m wondering about ways we can use Cloud 9 in my school.

Could one teacher have an account with multiple “Named” users (students)?
Can students who are under 18 use your site?
Can there be one account with multiple users?
What information about students would have to be provided if this is a possibility?