I have some basic questions about using SL in my class (community college - intro to gaming/simulation class). I have just begun playing around in SL, so please forgive the NOOB questions!

1) When using Campus Second Life, you get an acre to work with, can you divide this up so that different student groups can build in their own sections of the acre?
2) When the class is over, is there a way for students to save what they have created and upload those files later using their own non-class account?
3) I read that nudity is only allowed in mature areas; however, when I teleported from the initial tutorial area there were two nude avatars visible. Is there a way to prevent this on a classwide or individual basis for students who might be offended by nudity/mature content?
4) Does anyone have a sample disclaimer/agreement that you give to students before working in SL? (E.g. "Just like when working on the Internet you may find content that you find offensive or objectional.... etc." so they are warned beforehand about some of the issues that may come up?)
Thanks!

Deb