Check out
www.kamadoguru.com,
www.nakedwhiz.com, and YouTube for great Kamado recipes and cooking tips. Find the know your Joe videos on YouTube (there are links on the kamado guru forum under the Kamado Joe subforum) to get a good intro on setting up your KJ, starting fires, controlling temps, and basic cooking.
Besides your pizza stone, you will want to get 4 copper elbows. You put the elbows on top of the head deflector, and your pizza stone on top of the elbows, to let air circulate under the stone and keep a more even temperature. You will want a pizza peel too.