There are numerous schools thru out the United States. Check with the rodeo crowd in your area. They have pipeline of info on what's happening in your area. You also could go to my link page, by clicking on the bull rider at bottom of this page. There are seven good schools listed there.
Next step is internship.
Find a practice pen in your area and get the permission of the stock contractor and the fighters first. So that you may join them and work under their watchful eye. They'll let you know what and how your doing. From there, it's on to other arenas. Also, I would like to add.