Long exposure is a great lesson when you want your students to really understand your shutter speed. This is the first time we work entirely is Manual with manual focus. We have used Aperture, and some students have done some self-initiated manual setting work but this is the first time they were all forced to control every element of the camera process.
Here is a great video that was made by a photographer, that does a great job of showing some interesting techniques.
Here are my standard settings I have my students set for their cameras.
On another thing that I would recommend, is setting your focus to Manual, because the camera is not smart enough to focus in the dark so you will have to do it manually in order to get it to focus on what you want it to.
Their assignment:
7 images total
1. Light drawing2. Portrait3. Delete the background 4-7. the rest can be whatever you want
Here are some great examples of student work from this assignment.