Dissolve  yeast in water and let set until bubbles begin to appear.  Mix 2 cups flour, salt and oil.  Yeast mixture should be ready, mix it into bowl with fork.  When sticking together, turn out onto a floured surface and begin to knead until dough is no longer sticky.  Let set in warm place 5 to 10 minutes, then roll out for oiled pizza pan.  Oil top of crust for better browning, then add toppings: 
Tomato sauce, other toppings and top with Mozzarella cheese and bake for 10 minutes in oven preheated to 500 degrees.