There are no measurements because all this is really to taste and depends on what you want your final result to be. For sweet, use more basil, sugar, onion, and parsley, and less garlic and peppers. For spicy do the reverse. The key for that nice “Italian Sausage” flavor though is the fennel seed. Use some whole and more that has been loosely broken up with a knife.
Blend it all up thoroughly then let sit in the refrigerator overnight to allow the flavors to settle.