In the back for the first couple (assuming ab-initio), but make sure that they know which one is the flap lever and which way the trim goes before they get into the front.
I've done a few conversions from C152s etc. and then they can go straight into the front because I know that they know about trim, carb heat and flap levers (if applicable). Haven't actually taught ab initio in a Cub though I would dearly love to. Makes the cross countries a bit more fun when you can land anywhere!
As for how to teach them to start, well that's what homework is for, and if they can't recite the drills in correct order (with some prompting) they're in the back for this one, 'sorry but do your homework or bring a checklist!' Patience works well too, and taking the time to explain things has worked for my students so far.
Good question, haven't seen your name around for a while Vanessa.