One resource might be the "Professional Tarot" subforum; it's a couple of rungs above this one ("Talking Tarot").
I've taught classes, with brief workshops worked in. I like the workshop part best, as it is the "hands on" aspect of the presentation, and that is a perfect platform for teaching tarot. If that's what you have in mind, then a lot of your work is done for you, as the primary focus is face-to-face reading practice. From there, the students will come up with their own questions regarding more of the basics, or maybe even specific techniques; you can flow with where those take you. The opportunity to just dive right in provides for a lot of great energy, and you'll likely wonder what you were worried about.
Also, one helpful thing to do right away is to survey your students and find out what they already know and what they hope to learn/do in the class. That goes a long way toward directing the rest of the experience for all concerned.
