yeah first off would be understanding your boys's age.
definately suggest something out of the 4 stroke offerings with a click shift (no hand clutch) for learning. I suggest the 50cc honda for ages up to 10 depending on the kids physical size of course then the 70cc honda from there up & after that you will be your own expert.
the honda 4 strokes are bulletproof & have very mild manors as far as bikes go, very lazy, easy going & easy on gas.
