Dear horselover1296 ,
you need to start off by getting a sponcer and winning a lot of hourse compations that include jumping to build a good rep. for your self and horse.
It takes a long time though and a lot of work. Once you work up there though then I beleive but I am no sure that you have to try out and qualify I could be wrong though and you can always try a google search to be sure.
Hope this Helps. Faolan Blood
if you are reeeeeaaaaaalllly really good go look for some sponsers and get on big shows qui ck to be recognised and gets some ribbons under your belt if your not super good just work on it for now and enjoyn while you can.