I used Gleim's Flight Instructor Flight Maneuvers and created a lesson plan for each topic in there. I view them as not something I'm going to repeat verbatim to a student but something that I can use to guide my lesson/discussion/demonstration. Its amazing how after you've passed all your other ratings, you don't even think about maintaining heading or altitude; its all second nature. Then you realize while making your lesson plans, that there is more that goes into it than you otherwise would have thought being so far removed from your PPL days. I also went so far as to draw diagrams on a few of mine; the same diagrams I will use to teach on the whiteboard. Also be sure to add any material/schematics/articles, etc that you'd like to pass a long to your future students as well. This is what I've done at least.