Ok, Simple way is to go to your local pizza place (hopefully not a chain) and get them to sell you the dough for a couple of large. It would make about 6 personal pizzas. Or you can use a thin crust recepy from the net, but the whole letting it rise thing takes patience.
Then go ahead and make the pizza sauce.. kind of like spaghetti sauce but use a little more tomato paste. I think sweeter works better for grill pizza.
Chose your ingredients, Chicken, sausage and tough vegetebles (onions and peppers work best) and precook the meat. Soak the vegetables on olive oil and spices.
Stretch the dough ala pizza place... if you have never flipped, don`t try... just kind of use your knuckles not your fingers. Do a layer of olive oil (spices like garlic, oregano etc help too) on a baking sheet or on top of aluminum foil. build your pizza there placing a light layer of sauce, then toppins and cheese last (mozzarella's is always best, mixed with munster is also a nice flavor for the grill.)
It works a lot better with charcoal putting all of the charcoal in one corner and cooking the pizzas opposite. They take about 15 minutes each (make sure the grill is already going).
The secret to this being fun is letting people kind of build their own and have even some BBQ sauce available (Rays of KC MasterPiece are my fav). Experiment but don`t burn... they cook quick.
Let me know how they come out