What Howrse Divine are you?
On Howrse, The Grand Prix is a week-long championship consisting of five different competitions - one taking place each day. The Grand Prix is run every week and has two versions - Classical and Western.
This is the training method that I find works best for Western Horses. There are lots of other methods and approaches out there - some people like to vary the method depending on the breed. However, this is a good place to start if you're looking for something simple to follow that works on all horses.