details for sharing?

details for sharing?

I'm a teacher and I want my classes to use Sheet for an ongoing project. I have a few questions:

Sharing: My students have all added my username to their share list for the assigned sheet. Is there a way that I can automatically add their names to my share list for my sheets, or do I need to manually add each one? Some of their names appear in my "shared with me list" and the others came as a link in an email.

Sharing: Is there a way to set sharing so that only those in a group can view all documents or sheets that a user has created? Or can we only share through individual documents/sheets?

Where can I find some help files that spell out exactly how to share and set up groups? Up to this point, it's been a big trial and error project.... I'd like to have something specific to share with other teachers at my school so that we can all take advantage of this awesome service!

sherill