As a coach of U16 age groups in recent years...
lots of good advice above !
* DO treat it as a real game
* DO NOT back off cos "its only kids"
* DO bone up on the U16 regs/laws (and I see you are
)
* Tolerate NO shit of ANY type.
* SMILE. JOKE - when appropriate.
* DONT'T be a school master - but be very firm and explain appropriately.
And of course enjoy it. Expect the pace of the game to be high, but quite a lot of tunrover. (This is generalising - some U16 squads are better than senior men!)
But really, really do understand what is a scrum, what is a FK, what is a PK. Possibly the worst reffing display I saw last year was a coach/ref that just awarded FKs for almost everything. He gave the impression of being out of his depth, to the extent that many of our players were asking us (their coaches) why a knock-on was now a FK and why offside was a FK etc etc because they were confused OR thought/knew the ref was wrong and was a twat. (we did our best to keep them focused!).
Have a great game. You have the advantage that you are still an active player and there for within a low multiple of their own age ;-)
didds