Google Classroom saves you time, keeps you organized and helps you communicate with your students. You can also set up virtual office hours with a Classroom & Hangouts collab. Here are two valuable cheat sheets that you need to see. One for students and one for teachers.
Google for Education has a site that is extremely helpful. Here's the link. Follow it if you know what's good for you.
Create a class with no students. Invite co-teachers to collaborate. Reuse posts from this classroom for your real classrooms with students.