Go to your class in Google Classroom, and click on the Generate Link on the left below "Meet."
You can see the link and you have the option to make it visible to students.
This copies the link to your clipboard.
Click on the link icon and paste the link. Add any other information.
After you do this, you make sure your camera is on, then click join the chat now. You have to approve everyone coming in.
Make sure you end the call for everyone. When you do this, no kids can join in and have their own private meeting. You will also get an email with the history of hte meeting as well as the times the kids where there in a spreadsheet you can open.