To get content to assign you have to go through the site to the specific content page that you want your students to do.  As of yet I haven't been able to figure out how to assign a whole unit, only video by video or practice section by practice section.  For the SAT content you can only assign videos not the practice.

Mostly for monitoring I check the activity tab, the progress tab, and the SAT tab.  Although I think that for the assigned activities it will show a list of students completion on the assignments tab.