If you are looking for different pizza ingredients in the capacity of an individual as opposed to a business, I would look under the Resources section of the forum to see what is available near you. Once you start a business and have a tax ID or whatever else is required, you will want to look at distributors and foodservice companies in your area. Many of them have a very broad range of offerings at much better prices than you would pay for the same or comparable items at the retail level.
To get an idea of which pizza ingredients are most popular among our members you might want to take a look at the Ingredients boards of the forum, including dough ingredients, sauce ingredients, pizza cheeses, toppings, etc. I would pay close attention to the favorites of our members since they are the most discerning pizza eaters around. Ultimately what you will use will be dictated in most cases by the economics of your business.
Most home ovens tend to max out at around 500-550 degrees F. Commercial deck ovens often operate within that range, and even higher, but some pizza operators operate at around 450-475 degrees F. Many conveyor ovens are often used in the lower range also. The temperatures will also depend on the types of pizzas made, sizes, volume, etc.