You can add pages and subpages about anything you like - Your class, content area in general, maybe a class project page you are spear heading, what you research in your spare time, or extra resources for your classes.
These pages work like traditional web pages. They can be linked to one another, the can have hotlinks, photos, flash, videos, all the good stuff. You can use built in templates, build your own using the WYSIWYG Editor, or go old school html source coding if you really want to. Just don't forget to turn on your spell check! (You have to turn it on every time...) I also recommend viewing you page on the live site and not just trusting that the spacing is always going to look like you think it should.
I have examples of the templates in the following pages. I didn't do anything creative with them, however with the built-in editor alone, you can make them pretty fancy. Look through them, change your colors, choose your pictures, dream a little...
Build your content! Be creative! Have fun!