Here are some resources for lessons and activities you can do with your class.
Hector's World is a fabulously resourced award winning New Zealand site with videos and lesson plans to support learning safely on line.
Lesson plans and access to Hector's World videos can be found here.
You can also download the Hector's Safety Button that floats on your screen- if a child were to see something questionable on the internet all they have to do is click on the Hector's World dolphin and the screen goes dark while the child seeks advice from a trusted adult. Get it here.
Remember to turn on Google Safe Searching and save it. Here is how you do that.
A PC simulation of the threats you might come across while surfing the net.