Check out the tutorials to learn how to create small groups within one Google Classroom.
Just like anything else, if you try to take in too much too quickly, it can be overwhelming! Pace yourself and just take one step at a time- before you know it, your Google Classroom Sites will be amazing!
Here's a link for "60 Smarter Ways to Use Google Classroom" from Teach Thought:
How to set up a class
How to give announcements, assignments, and quizzes
How to set up topics
"Setting Due Dates/Times and Changing Your Notification Settings in Google Classroom"
Credit goes out to North School's LMC
Communicate with parents
Adjust the levels of edit/post rights for students
Copy course for different semesters/classes
Watch this video to learn how to maximize collaboration projects with Google Classroom.