By all means, attend a Summer Seminar sponsored by a cooperating college or university. They will normally have courses specifically designed for teachers of AP Courses. Second, visit the nearest college or university and buy yourself a survey course textbook for your field. Prepare your lessons from that text, NOT the text you assign to your students. They must be taught early on that they must actually READ the textbook, not look up definitions in the glossary. You should prepare your tests with questions from both your reference text and the student's text to keep them honest on the reading. Sacrilegious as mit may seem to some students, they must not only read the textbook, they must do it on their own time--at home, probably at night. Lecture as little as possible; teach socratically so that students will have to think for themselves.
Since the course is to get the students a college experience, you should assign a sufficient amount of work to be completed outside class. If your field is the humanities, it should be reading intensive, preferably books of scholarship in your field, and certainly not a teenage novel. Set high expectations for your students and hold them to your expectations. Many will receive grades lower than they have in the past; but in the long run they will bless you for it.
Finally, develop a thick skin. Until you build a reputation for yourself students (and all too often parents) will find fault with your teaching methods. Since you won't be spoon feeding them, the often heard complaint the first few years is "you don't teach." Don't take it seriously; remind them that it is a college level experience, and they must adjust to it. Even though they resist, they will benefit from the experience; and over time, your experience will make you a better teacher.