Introducing the Digital Camera: Keep It Simple to Start
Today's cameras offer many elements and features, but the last thing you want to do is swamp kids with them right away. Stick to the basics in your introduction, and let the kids explore the more advanced features on their own over time.
The key elements to introduce are the on/off switch, inserting and ejecting a disk, the shutter button and the viewfinder. Depending on your schedule, you may want to introduce only one or two of those elements in a day, or all at once, but be sure to consistently review everything you've done before at each new introduction.
At this stage, you'll also want to introduce saving files to the hard drive if you haven't done so already in another context.