You cannot by a black horse. You must impregnate a horse and hope the baby it has is black.
When the pony is going to be born save the night before. If you wake up and the pony is not the color you want just reload your file and go back to sleep. Keep doing that until it is the color you want.
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you just have to keep breeding horses you currently have to get a black baby
That depends on which Harvest Moon you are playing. Most of the time you have to get near the horse and press a button to jump on. However, in some games you have to do other things such as taking the animal outside or you'll have to befriend the horse before you can ride it.
At the start of the game, you have a horse and cart. If you live in konohana, go to Kana's animal shop to rent a new horse or buy a new cart. If you live in Bluebell, go to Grady's.
You can't get a faster horse. You only get one horse throughout the game and there is no way to make it go faster.
Just press A.