For a first horse I do not recommend a dvd. You need a live trainer. Once you take a year of lessons then you might be ready for Parelli or Clinton dvd's. There's thousands of natural horsemanship dvd's out there. But before you watch them you should know/learn some things about reading a horse and handling them. You need hands on help from a trainer.
Good luck w/ your horse. Your horse is beautiful. If you want to do Parelli later on we can help you get started.