I've only taken one quilting class in person so far, but I've taken lots of other types of classes.
My #1 thing I would expect is for the instructor to BE ORGANIZED, and/or have a helper that can take care of that for you. I hate sitting idle and wasting class time while the instructor fumbles around trying to find something in the middle of a demo or explanation. If it happens once or twice it's no biggie but some instructors, I've felt like half the class time was spent watching them root around in a bag or dig through piles of stuff on a table.
Having fun is also important, of course! I learn best with a sprinkling of laughter.
It sounds like you're going to teach an interesting class! Too bad you're not local, I don't really know how to use most of the "fancy" feet that came with my machine.