One word of Caution.
"First horse show" is terribly infectious. Can easily be transmitted into a chronic life long condition. FHS quickly becomes SEW - "SHOW EVERY WEEKEND". This can be easily mistaken for WDMMG - or "Where Does My Money Go".
Symptoms of above include obsession to clean horse and tack. Frantic searches for shows, unceasing MOM WE"RE GONNA BE LATE AND I"M GONNA MISS MY CLASS" remarks.
Frequently is accompanied by "NTBMH" - (need to buy more horses), "NTBBT " (need to buy bigger trailer) and Empty Wallet Syndrome.
Benefits - self confidence, friendships, and self esteem!