If you're putting up streamers or flags atop a pole spaced at some interval down range, the highest one need not be higher than your bullet's highest trajectory point. Any higher won't wave in the wind that blows on your bullets.
While all sorts of things have been made and written about to help folks get the hang of reading the wind and correcting for it. Nothing's as good, nor as fast, as getting a friend who's a crack long range shooter that reads the wind very well to shoot for you. You read the wind and give him the corrections and he'll put 'em on his sight. You'll get instant feedback as to how good you are. If you can do it on a rifle range with someone in the pits pulling and marking the target, that's the best way.
US Navy Distinguished Marksman Badge 153
Former USA Palma Team Member
NRA High Power Long Range High Master
NRA Smallbore Prone Master