Hey, yeh I kinda agree with everyone else but if you are willing to learn tones of things and you have loads of people around you that no about horses and are willing to give a hand then all means go for it.
I would say that your best bet is to get yourself an old horse just to start of with, there for the horse will (hopfuly) be educated and you will learn with this horse...and after that who nos then you could go on a get yourself a yearling and teach that just lik you hav been taught what you no.
No one hear is trying to be rude or anything its just that if you put to and to together then yeh could end up a bit messy...do your homework and get educated or at least people who no what they are basicly talkin about, to help you out.
Everyone needs to start somewhere but I wouldnt sugest to start with a yearling, an old horse is always the best (when they have had basic education or more).
Please don't take this the wrong way we are all just trying to help!!! There will be many more horses that will come in your life if this is the path that you chose don't think that this yearling will be the only one.
Hope all of us help you a little...