If using a paver, if you have a BBQ with a hood you can use it similarly to a pizza oven by having all the burners on to make it extremely hot, and then turning the middle ones off so the paver is not on direct heat. You will find the pizza tastes better this way rather than the oven (I'm guessing because residential style ovens don't get to the temperature needed).

Baking flour is similar to cake flour I always thought, you really do need a bread flour or a pizza dough flour (which can be bought in a box from coles).