I rodeo queened for a few years and carrying flags in front of a full rodeo crowd is a blast!
But I think you are wise to wait a year, as everyone else has brought up things to think about.
Your horse needs to have a very good neck rein. Especially if it is a windy night, it takes all your focus and strength to hold that flag perfectly straight. You can't be worrying about controlling your horse.
Your horse needs to be comfortable in a LOUD rodeo environment. A lot of times, you have to run right by blaring speakers with the flag, so your horse needs to be comfortable with that.
It gets crazy hectic behind the chutes to pass off your flag, and go grab another one. Again, your horse needs to be able to handle that, and not be scared when people are literally tossing flags at your as fast as you can catch, get it into your flag boot, and GO again.
And flag boot is a MUST. Especially with a wind and a large heavy flag, you won't be able to keep it upright without a boot.
And most of all remember: You are carrying a SPONSOR flag for someone who is giving money for the rodeo. If you drop their flag, or don't hold it straight, or whatever, that's playing badly on that sponsor. They won't like that. You've got to keep the sponsors happy and present their flag correctly.
Prepare yourself this year, haul your horses to lots of places to see sights, sounds, and noises, build a flag at home to practice (buy a wooden dowel for a closet and staple a large piece of noisy flapping farbic to it), and desensitize your horse to it.
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.