After you've created a classroom and invited students to join, follow the steps here for creating an assignment:

1. Go to your classroom and click on the green + Create Button at the top right corner of the Classroom feed
   
   
2. Choose New Assignment
   
   
3. Under Information, key in the title for the assignment, as well as the deadline and instructions for students. 
   
   
4. Under Attachments, you have the option to attach audio examples or any other files relevant to the assignment. 
   
   
5. Under Groups, you have the option to create student groups for group assignments. 
   
   
6. Lastly, you can choose to Publish Assignment or Save as Draft for release at a future date.