For the most part, you will use the video and print materials that are posted on the App Inventor Hour of Code page. But here are a few things to think about:
BEFORE THE ACTIVITY
1. Set up your computers and phones/tablets (or emulators) ahead of time. You don't want to waste class time fiddling with setup.
Setup instructions are available here. Also see: Setting up the classroom
2. Try the tutorials yourself. They are fun and easy, and you'll feel prepared to assist students if you've walked through them yourself.
3. Consider printing the PDF versions of the tutorials. Here is a handy link to all four tutorials in one PDF.
4. If you have questions, ask us. We're here to help! You can contact other educators and the App Inventor team through the FORUMS.