Talk to the training director of the club. Different trainers use different equipment.
Safe equipment you won't waste your money on is a prong, a 6' leash and a 15' leash. A ball (I like the chuckit balls with the blue tab), a tug.
I use a prong and a botcher harness. I started with a regular harness and he just dragged me down the track.
~The strength of one's opinion should not exceed their knowledge on the matter~