Tech4Learning has free resources for claymation, they naturally would like you to use the lesson plans with their software but they will work with any stop-motion app. Register to request their claymation workshop kit.
iCreate to Educate has free resources for schools. These are lesson plans that may give you some ideas for ways to integrate stop-motion into your curriculum. They are located in the store, you "purchase" them (requires registration) and dowload.
You-Tube - of course, there are quite a few YouTube videos. You can find tutorials on many specialized techniques.
Supplies - Tripod - min tripod (can be raised on books) - tripod adaptor for iPad / smart phone - foam shapes (craft stores)- Lego minifigs and other blocks - black line masters - yarn - wikistix - chinelle sticks (pipe cleaners) - and of course, clay.