Find some mentor candidates and swap stories about injuries you have treated. If they can match you story for story, find some one else to show you the ropes.
The above is advice that I would like to have gotten when I got the horse bug in my mid 40's. Saw wrecks every time we went out. Some clinics and different exposures made it clear why we had so many problems - look for a "good deal" (really cheap) on a horse that has done it all, saddle them up just before hunting season and you can learn about wreck first hand.
My next steed I plan to "deal on a good horse/mule" not get a good deal on them.
Good luck
