Eric Curts is a great Google Certified Teacher who shares some excellent resources at http://www.ericcurts.com. In this case he has prepared a guide for teachers looking to get started with Google+ in schools. With lots of screen grabs the guide is easy to follow and very thorough. Once you’ve got your Google Drive set up all you need do is to Make a Copy for yourself.
You might also like to have a look through A Google presentation that I have used to present to Science Teachers about using Google Drive.