Mark Kane and I will be working with 25 USD 261 educators tomorrow as they learn more about the great tools that Google & Microsoft have to offer educators. This class filled up quickly, so we know it is a hot topic, and we will continue to offer training and support for these applications.
We get this question a lot, which is understandable, especially when you are just beginning to use Google Classroom with students. I have a 261 Google Class set up with a few different types of assignments. If interested, just let me know and I will add you to the class so that you can explore the student experience.
Also, the following video clip contains some good information that will help you show your students how to do several tasks related to assignments.