Well, the best way to do anything is to research it. Find out who is teaching near you, and what they are teaching. It seems that more and more, a PDC follows a standardized curriculum. We have hosted two courses here with three treachers, all of whom had different teaching styles, etc, but all of whom were very well informed, excellent teachers, and who had many years of experience. And, as DJ suggests, getting the Designers Manual would be an excellent first step.