It all depends on what you're going to do with it. First, English or Western? I'm a Western rider, so I can't really help you with English riding. Since it's a Quarter horse, I'll assume it's Western. If you're going to do reining, get a reining saddle. Pleasure, get a pleasure saddle. Trails, get a trail saddle, western speed events, get a barrel saddle. I personally LOVE barrel saddles. I do all sorts of trails and moving cattle and speed events (barrels, poles, straightaway, speed, flags, etc.) And won't ever use anything else. It's easier to sit deep in the saddle. Again, it depends on what works best for you and your horse.
As for size, that depends completely. Get a size that fits you, and make sure it fits your horse right. There isn't anything that is special for 'quarter horses.'
All horses have hair and a quarter horse is an American saddle bred horse, and are used for all round general riding etc.
saddle horse
the saddle
Yes
The saddle
You can start putting the saddle on the horse at around one and a half years. You can start riding it at about two years, two and a half years.
If you ride a horse with a saddle, you're more secure, and its less likely you'll fall off. Also, with a saddle, your feet are in stirrups. Some beginners hold onto the front of the saddle when trotting. Riding without a saddle requires skill and balance. Riding without a saddle is called riding bareback.
the saddle.
W.D. Davis
A saddle is what a rider sits on when riding a horse.
saddle club
well the essentials are jeans, boots, a saddle, a saddle pad, a briddle with an apropiate bit,and of coarse a horse.