The amount of ingredients fit nicely in a 4 quart crockpot. I'd say this comfortably feeds a family of 4-5 with a bit of leftovers. If you have a large family or teenagers, add more rice and sausage. It's a pretty easy recipe to adapt to your needs.
If you are going to use uncooked pork sausage, I'd recommend browning on the stove top, and draining before adding to the crockpot.
Otherwise, dump all the ingredients into the crock, and stir well.
Cover and cook on low for 5-7 hours, or on high for 3-4. You're really only heating through, and allowing the vegetables to soften.
This will not stick together like a gloppy casserole; it has the consistency of fried rice. Use bowls to serve rather than plates.