I have only taken one formal quilting class (and I learned a bunch, and should take more!) but the lesson that sticks out from that experience is if you are having the class use some non-consumable of yours (in this case it was quilting stencils) make sure you enough enough that there will not be a bottleneck of students awaiting their turn. This could apply to stencils, cutters, irons, any specialized equipment...the class I took was for handquilting, using your thumb to rock the needle, so not much equipment needed, but the shortage of stencils slowed everyone down.
Alison