How to earn money to pay for horse?

I really want a miniture horse! My parents said I can as long as I pay for it monthly and pay for it completley. Any saving tips? Or how I can earn some money. estimated costs and maybe even doing 1 or 2 shows with it. Thanks
Update: Also how much should i save in advanc before i buy it. And do you vet check minis?
Update 2: Also i forgot. What gender should I get and how much should i spend on it? And how much money should I have for emergency? Thanks also i'm 13 and am an experince horse person.ALso what kind of worming and supplements? Thanks
Update 3: on the vet check i met before you buy?
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