A red dot is probably the easiest way to learn to shoot. It has no magnification, no eye relief issues, and no focus. There is nothing really to align. Assuming it is sighted in for the distance being shot, you just put the dot on target and pull the trigger.
The benefit of the red dot is that the newbie shooter gets to work more on things like hold, breathing, and trigger control without also having to worry about sight alignment. That isn't to say you should not teach with iron sights, but to suggest that the quickest way to get a newbie up and shooting that I have found is with a red dot. It really lowers the frustration level for those who don't "get" iron sights.
So not irons and not a scope per se with magnification, but a red dot optic.
"If you look through your scope and see your shoe, aim higher."
-- said to me by my 11 year old daughter before going out for hogs 8/13/2011