what level are your kids? Are they beginners, intermediate, advanced? Do you have to teach them basic computer skills.
I would say intermediate.
As you want to 'set tone' so give them introduction of digital citizenship and responsibility. Introduce and explain the significance of nine elements. It is important to mind them before entering in this fluid world.
Introducing a project that students will be working on over a long period of time may be a good way to get them going on the computers. Using Excel in the project is an example of one way students could put the computers to use.