Here is a good link to see what color possibilities there are in horses Equine Coat Color Calculator. I personally would recommend buying a foal rather than breeding. There is a lot of risks to the mare when you breed her and you run a pretty significant risk of loosing your mare, the foal, or both. It is also really expensive to care for a mare throughout her pregnancy and post partum. Not saying you shouldn't, but just make sure you consider all the risks involved and the costs. It is usually cheaper to buy a foal to raise one. Even a well bred one. My first horse was left an orphan when her mom died giving birth to her. My avatar is a mare and I love her more than most people. She is incredibly well bred and has nearly flawless conformation. I would never be able to risk something happening to her though.