I have been doing some blog posts lately on Google Classroom to address some best practices. If you are looking to getting started with Google Classroom here are some excellent tutorials other bloggers have created:

 

Amy Meyer: FriEdTechnology http://www.friedtechnology.com/2014/09/getting-started-with-google-classroom.html
Matt Miler: Ditch That Textbook http://ditchthattextbook.com/2014/10/16/the-google-classroom-quick-start-guide-tips-and-tricks/
Jeff Herb http://instructionaltechtalk.com/getting-started-google-classroom/
Aaron Svoboda Playlist of Getting Started http://mrsvoboda.blogspot.com/2014/08/google-classroom-how-to-videos.html
Jeremy Rochelle YouTube: Click Here
Google for Education YouTube: Click Here
Michael Fricano II YouTube Playlist: Click Here
More videos to be added