Google Classroom is now being used in our County in several middle and high schools. It is a great tool and integrates well with your Google Drive creations. Students who have RCPS google accounts can join classes you make. The benefit of doing things through Classroom is that it eliminates some of the sharing issues by making copies for your students and even naming those copies. All they have to do when they are done with a document is click "Turn In".
Here is a short video to see it in action...Google Classroom
Here is where you can get started with your classes...Classroom Start Page