Helpful advise on teaching Blender

Hi there

So I have been a 3d artist since 2008 and I have been asked if I could run an after school club to teach Blender and 3d printing.

My question is:

Does anyone have any helpful advise on the best way to teach children/young people between the ages of 11 - 14 how to use Blender and 3d modelling in general?

As I have said I have been modelling for some time but I mostly taught myself and it has come rather naturally to me as I am a very creative person. But I have never really taught how to 3d model before (I have taught before just not this).

Advise on teaching complete Noobs and children with basic interface knowledge would be best please.