Yes, 00 flour is a high-gluten flour and normally used for pizza.
Yes, always use weight, not volume measurements. So, 3% oil would be 150 grams. 5kg=5,000g. 5,000g x .03 (3%)=150 g. Water is the standard for weights, so 1 ml water weighs 1 gram.
IDY is Instant Dry Yeast and is labeled that on...