We are new owners and tried our first pizza tonight. It was a disaster - burned on the bottom and raw on top. How is the best way to cook it? At what temperature and on what? We tried one right on the plate setter with the legs down and the other on the grill placed on the plate setter legs up at approximately 600 degrees. Do we need a pizza stone and, if so, how is it to be placed? HOw long? At what temperature? HELP