I would probably start the same way you start our classes right now. I would have the class do two warm up problems one with a review of what we did yesterday and the second one as an introduction to what we are doing that day. Next I would verbally give the definitions of direct variation inverse and others and if they wanted to write them down they could do so. Next just as you, start off with the easier problems and gradually progress and get harder while doing and checking examples on the way. Lastly when I felt they understood it I would give three problems and have them do it in there notebook and have me check them and then they could work on their homework.