I teach two classes before students are able to get their iPads. The first is about Staying Safe Online. The students watch a video by Common Sense Media called Going Places Safely.
Then I read them a book I wrote called Staying Safe Online. The gist of the story is that the rules on staying safe the Internet are the same as the rules in every day life. That's because the Internet is an extension of the world around us. The story goes through different scenarios to make the point.