I think, you should explain the interface first. split window, buttons, etc. very important is the fact, that blender windows doesn´t have to be clicked.
Or in other words: try to realsize, what you need at least, to get started in blender. And try to imagine, what would cause a newbie to be puzzled. Do the things one at a step and always give examples. try to be slow. One always tends to forget, that one´s own knowledge is not at all common.
And if they never had cg, then start with the PC turned OFF. Give them the idea of threedimensional thinking, how edges and faces work.
use a big cube. to do this
If you have a pc for everyone, then let them make a small scene, step by step, with easy lighting and material, so they can get confident. less is more at the start.
I always stick to the rule, that it is most important to foster selfconfidence. Confusion is death.
Plan on paper. Write your concept down and check, if it is propperly sorted.
I´ll do something similar in the next weeks. Sorry that I cannot post my whole concept.