We have a soph on our HS team who seems to be a natural ten-eventer - big, fast and athletic. Last year he threw the shot and discus and ran both relays - well. While we will teach him the rudiments of all the events so he can do a couple decathlons this summer, we're thinking we would like to help him really learn at least one other technical event this year.
I'm thinking the hurdles this year, and then the long and high jumps the next, and leave specific pole vault and javelin work 'til college.
But this is just my thinking. Is there any kind of established progression for this sort of thing?

