For perfect cheese shavings, you need to recognize the right temperature: it should neither be too cold nor too hot. A peeler can remove in very thin slices which curls over onto itself. Grana Padano cheese works very well. Try This!
For the choice of toppings for your pizza, go with your mood. The proportions are difficult to quantify. Just remember not to overload the pizza. At the time of eating, you need to be able to take a slice in your hands to eat it.