I'm going to be quite honest here....
I don't think you know what your getting yourself into...I'm not trying to be relying you how you spell, but by the way you do spell you seem like a little young.
First and foremost, if your going to breed your mare then you should have at least a good $5,000 in your back pocket. If you don't, then don't do it. You have no idea if something is going to go bad during the pregnancy or when the mare is in labor. If I were you, I would look at this thread: Proof it isn't cheap to breed 101
Does your mare have good conformation? Does your mare have good bloodlines? What about show career?
Just because you want to raise it from a foal, is not a good reason to breed your mare.
What about the stallion? Is it a worthy stallion? Does he have any show history, etc.? What about his conformation?
As for the baby, what are you going to do with it? Sell it once your done breaking it out? Are you going to show it, and I don't mean 4-h, I mean breed shows.
There are many questions you need to ask yourself.