Nice leaflet David, most of your tips will be as useful for beginner adults too.
I most definitely was not measured for my first bike - I think the main requirement when choosing it was that it would allow at least 4 years of growth. ;) Amazingly it survived 10.
My bike being massively too big to start with, then eventually too small, didn't put me off, or cause injury, but today when I see kids riding ill-fitting bikes (usually with parents who look equally uncomfortable on theirs) I wonder why bike fit advice isn't made a lot more available at point of sale.
tl;dr: Perhaps include something about reach/saddle height?