First off, there is no way you should even think about a horse if you've never had a riding lesson or even have any horse experience. I took lessons for around 5 years before I got my first horse. My horse was actually a over grown pony, which I can still ride even though I'm taller now. Minature horses cannot be ridden, however. At least they should not because they are not built for it.
And if you are thinking about breeding a horse PLUS you have zero horse expereince.. That is a horrid idea. Unless you are open to the fact that those babies grow up, cost alot of money, and most likely will end homeless like thousands of horses. And homeless horses don't just run free, they get sent to slaughter which means later on people are eating the unwanted horses. Do NOT consider breeding, it will just be a terrible situation.
Also, just because a horse is smaller does not it is any easier to handle. Smaller horses just eat a tad less, but they need just as much care and dedication as a regular size horse would. There is still lesson costs with this horse, which wouldn't cost less because the horse is smaller. Farrier costs, tack, fencing, food, shelter. There is costs that come with every pet, no matter how big or small. And as for breeding, people who responsibly breed horses still have to deal with huge costs. Simply breeding can cost anywhere from $100-2000 depending on the stud. But then you have to pay for multiple vet check-ups, and even then the cost of having diffuculties with the foal. The mare could die, aswell as the foal. You could end up spending thousands of dollars just for an animal who will just contribute to overpopulation.
In my opinion, from what I've heard, you are not suitable for a horse or pony. If you just want to jump in and start breeding horses that are already being killed because of over population there is no purpose for you to join the horse world. If anything start taking lessons. You can get your fix of horses there. If that's not enough, see if you can help out at a farm. But do not just go out and think a horse is an easy deal, it's not.
I have two horses, which I have to wake up every morning and go feed. Plus there is training them, grooming, cleaning up poop, fixing fences if they fall. I have to do this every season, whether theirs snow on the ground, or the sun is beating, or the pastures are swampy. I know it wouldn't be any easier if I had ponies, they need just as much care. I've had to go out and put up a pasture fence that fell. It was out in the swamp in the middle of the winter, plus I fell through the ice a couple times. Are you willing to do all of this just to have a horse sit out in a pasture? It's not like you can make any money off a horse when it's just sitting there, and with breeding you loose much more money than you are making.
If anything get an experienced horse after a couple years of lessons. Horses don't always listen, and aren't always what you might dream. Sometimes I absolutely hate my horses, and others it's like I'm in some sort of dream. But either way, it's not an easy ride. Even if this is not what you wanted to hear, it's true. The first horse I got wasn't completely trained. I've gotten thrown off of him quite a few times, and I've had to go to the hospital. You can still get injured by a pony, too. I've been kicked by all sorts of animals. Trust me, a pony might be smaller, but their kick isn't much softer.
Sorry if I seem harsh, but it's the truth. If people just tell you sugared up things you will be in far over your head. Horses can be fun, but it's not always just fun and games.