My sauce recipe is a highly guarded secret. With that said, creating a unique blend of spices to add to your sauce is a trail and error process. Several ingredients can be added depending on what you are looking for. Most popular are oregano (ground, or chopped), basil (ground, or chopped), salt (onion flavored, garlic flavored, and plain), sugar (fine and course grind), pepper (different levels of grinding and hot), and some places use thyme.
If you are using one 10# can, your spice added can vary from 1/8th of a cup (very strong flavor) to 1 teaspoon (very weak flavor).
The sauce brand that you choose will also affect your flavor.
Your method for thinning the sauce with water will also vary depending on the brand of sauce.