Awwwww! I love yearlings. I actually prefer to get mine as weanlings, they are very easy to train that way, I think. Then, by the time they are old enough to show, you have a really solid beginning with them, and it's not like you have to rush or anything. I have QH's, and they are all pretty calm and very trainable. I prefer the NU Cash, Peppy San, and Hollywood lines, though, because mine go to be reiners, but all of mine are really calm.
I prefer fillies, mostly because if they get injured, you can still breed them, you know? But the downside to that is when they're older, they might be constantly in heat around other horses... I have a few of those lol. Then there's always the colts. They're fun, too, but I just like fillies. I show all mares though, but sometimes it's nice to not have to worry about "mare stuff". Ha. It's really just a matter of preference, I think. When I go to buy, I don't go with a set mindset. I go thinking, "if I see one I just HAVE to have, I'll buy it. If I see one that I like, I'll think about it." Anything other than that is really not worth it, to me. If I don't have that.... attraction, if you will, then I've found that I don't enjoy working with the horse as much. You've gotta really have a connection. Because there are just so many horses out there, and so many yearlings... Just find the ones you like. Don't buy because they sound good if you don't want them enough. That's a lesson I've had to learn the hard way lol. Sometimes I just had a feeling and bought them anyway, and they've turned out to get injured at all the wrong times, be poor keepers, be hard to work with, etc.
Good luck, though, and have fun! I'm excited for you! =)
Sorry for the book, lol.
To rein a horse is not only to guide him,
but also to control his every movement.