A basic outline of Google Groups is available. Below are other common FAQ questions and answers
Q. Will the email in the generic account be migrated?
A. We ask that you forward the email from the generic account. If this causes too much trouble, send a request to the help desk and we will look into this.
Q. Can we create our own groups?
Q. I sent an email to a group I'm in but it didn't arrive. Why?
A. When you send an email to a group that you are a member of, Google doesn't send you a copy of the email. This can make it appear to you as if the mail wasn't sent, unless you are aware of this.