Here are a couple of other websites that you can do local searches by state to find out more about horses in your area.
www.equine.com
and www.dreamhorse.com

Do you ride at a local stable already? If you do they could answer a lot of your questions about the equipment and food and cost of upkeep in your area. If you don't ride look into visiting some riding places in your area and if you find a horse you like it is important to try it before you buy it so you don't get any surprises!