I would use something besides the Jiffy crust mix. We often use the pizza crust in a can from the refrigerated section. Frozen bread dough can be thawed and used also. Pre-baking the crust is a good idea. We have one of those stone pizza pans, but seldom use it since the crust doesn't get crisp when we use it.

Pre-cooking the sausage helps. I like a lot of sauce, we just use spaghetti sauce from the store.

Speaking as a dairy farmer, be sure to use LOTS of CHEESE!!