What exactly do you mean by sponsoring? Do you mean donating things to a horse at a rescue or?? Not a term I am familiar with, where I am from at least, so I'm having trouble picturing what you mean?
And again, I'm wondering about the QH you posted about in another thread when you said "we have a QH". Does your family already own horses and you want one for yourself?
I also don't understand why the land would have to be "zoned for horses" just to take the horse for a trail ride.
The bottom line, OP, is that in your posts, you come off as a little entitled. Your dad doesn't owe you a horse, no matter how much money he makes. It's his money, not yours. That said, if he promised a horse on the condition that you work at a barn for a year, and isn't following through - ASSUMING you actually followed through on your end - then it's unfortunate and I can understand your disappointment. Parents shouldn't promise things they don't intend to ever deliver on, but sometimes they do. However, you need to be honest with us, but even more importantly, with yourself. Did you really hold up your end of the bargain?
Notwithstanding, my initial advice stands: learn as much as you can, spend as much time as possible with horses, and someday, when you are an adult and can pay for everything as well as take on ALL the responsibilities, you'll be more than ready.