Navigate to https://classroom.google.com
Click on the plus (+) symbol in the top right corner of the screen
Click on "Create class" in the dropdown menu
A window will pop-up after clicking on "Create class"
Fill in the appropriate information (Class name is required)
Click on "Create" in the bottom right corner
Congratulations, you have created a class!
Creating a class also creates a folder in Google Drive that saves all documents that are posted in the class
After you explore what Google Classroom offers with a class, go to Adding Material to see how to create assignments.