First thing first, you must know that a horse is a very responsible job, a horse isn't like a fish that you feed and clean out it's tank and leave it to entertain it's self, a horse needs much, much more attention like cleaning it's paddock/stable, feeding and feeding bills, vet and vet bills, grooming and lots more
CHOOSING YOUR HORSE
Horses are expensive themselves, you need to buy a proper-perfect-for-you-horse not just the cheapest one or a expensive horse that doesn't suit you, don't choose the most beautiful horse, give other horses chances, don't scroll through the horse sales and pass all the ones that look a bit scruffy, read the explanations about them maybe write it down on a piece of paper and look for some more that might suit you, but you MUST ask your parents for permission before you put up any posts or email, privet message or call them! Before you start emailing, privet messaging or calling anyone about their horse, you have to have a talk with your parents about, do you have the money?, do you have the time? and do you have the experience. Your parents will probably make points like this- What if the horse hurts you?, The horse would need shoeing, worming, dentist and probably vetting, he may get sick once. So whatever comments your parents throw at you like the ones i have listed, there is a possibility that you might have to pay sudden vet bills or you run out of money to pay for the worming. Talks like these usually end up with tears, if your parents say that you are not ready for your own horse, they might say try leasing a horse.
CONVINCING YOUR PARENTS
Convincing you parents may be a hard job it won't happen over night, it may take months, don't nag or beg 24/7 it won't help. Show your parents that you deserve it. Start cleaning out your pets litter, do the dishes for your parents or cook dinner for a week, do good deeds like that. Go to the library and read books about horses (information books) that may tell you parents that you really are working hard to earn this horse and you may be closer to your parents saying yes, take riding lessons or volunteer at the stables, if a friend has a horse ask kindly if you could come to see it and ride it. Start looking on websites like VicHorse.com (Australia) Horse Deals and lots more, maybe your riding school might have ponies for sale. Look for agistments that are not too far away from you sign yourself up on the waiting list (this may take a while, up to around a year!) Remember that your parents aren't going to pay for everything you need to pay for agistment fees and feeding. Plan a report by doing allot of research on the Internet or magazines, look for farriers, horse agistments, dentists and vets, make sure all of them are near you mostly the agistment because you will be driving there at least four times a week! Don't choose the most top quality one that is an hour away from you when you know a friend has a horse at a not very good one, it is better to have a friend with you who you already know, that can start you off and if it is closer that would be the one you would head for, but having strangers around you is a little stressful for a child but you will eventually know them. The prices of the equestrian centres can be big but you can find some that are very convenient like you know someone who goes there, it is $60 per month and it is only 15 minutes away from you.