That's a great idea Quadraxas and it's really good of you to willing take the time to do this.

I reckon for starters, the best way could be to arange from
Basic to Medium to Advance. An example would be Basic player movements, Basic AI, Level building etc. Then in medium you could have Weapon handling,Advoidance, paths, doors sprites etc, Then advanced could be stuff like Multiplayer, physics etc.
Hope these suggestions are a start to get this idea of the ground.