Congrats on your 7336, I just got mines too, you will need a 5" or 6" hook&loop backplate depending of the size of foam pads you are going to use, 5" for 6"-6,5" pads and 6" for 6.5"-7.5" pads. The 7336 comes with a 6" PSA backplate which will not work with loop foam pads, you will need to convert it to a hook&loop plate if dont want to buy a another backplate since they are expensive for what they are. 5" conversion hooks can be found easily, but its harder to find the 6" conversion hooks.
Try to get a 1X yellow, 2X white and 2X black pads to start and since your in Cali it should not be too hard to find them. You can get them from this site they are in Cali too. (Dang ...nice weather and sun everyday ! )