Wings, need your opinion

[BigGref]

I am putting out a philosophy question for wings. For games what do you tell players on the end (Offense and Defense) do you; say nothing, tell them you are end or back, tell them when you are 95% sure they need to scoot up to be an end, tell them to back out of NZ so you don't flag 'em? What are your opinions for Varsity (completely quiet v. help at times), 9th and JV, and JH. Thanks ahead of time and good luck!!