Agreed with Kit.
You just can't make enough money in the horse world to support a stud unless you are in the top percent of trainers/riders in the world. And unfortunately, you do need money to get IN to that top percentage, as well as raw talent.
My boss, who runs a small-scale breeding farm, started out wealthy. She has a wealthy family, and a very wealthy husband. Her and her horses live on her 'super' pay outs from the bank.
She does have a stallion at stud- but any money she makes off him is peanuts compared to the cost of keeping 12 horses. Her young stock sells irregularly. She may sell 3 in one year, and then none for a couple years- and then perhaps have another sale.
You just CAN'T make a living out of it unless perhaps you own a thoroughbred stud selling racehorses into the industry.... even then the successful TB studs I've seen have something like 10 stallions and hundreds upon hundreds of mares. Each stallion is serving 4 mares a day during breeding season.
So yes, they make money
But how are you going to purchase hundreds of horses and keep them fed/cared for until you start making an income? Where are you going to find the money to purchase well-bred and successful stallions? Do you know how much successful/proven stallions sell for??? Google it. It will blow your mind.
Near impossible unless you already have a large fortune.
So here's my advice- either keep following your dream and be content with one mare for breeding and no other horses, or get a job in a well-paying area of the world (i.e. go to college!) and keep horses as your hobby. Then you may be able to afford a couple mares and perhaps a stud in the long run.
Or win the lottery.
With training.... a better choice- but you better be a darned good trainer if you're going to fill your books. It's a hard life too. My friend trains for a living, and she is constantly hurt by aggressive horses, or ripped off by shady horse dealers.... you better have good insurance! ($$$)
I also dabble in a bit of training, and I get minimal wage the same as every other horse job I've had. You can't fund horses on a minimal wage- trust me! I've tried.
Don't let this discourage you, I'm not trying to be mean. Just realistic.
I had the same dreams you have (and still do!) but realistically, I probably won't see them happen until I'm mid-age or older. That's just the way of it.
I'm waiting for a rich husband to come marry me haha!