This video will show you how to set up your Google Classroom class.
This video will show you how to make an Announcement in your class.
An "Assignment" is when you want the students to complete something and or turn something in to you.
Tips:
Keep the title of Assignments short
Put the directions for the Assignment directly on the document if one if being created for the students (This keeps them from having to flip back and forth between screens.)
Attaching a Doc from Drive to an Assignment in Classroom
This will show you what the student's see. It is different to what the teacher sees.
It is good to understand what this view looks like for when you are giving instructions to your students.