You're going to get 20 different answers because there are so many different ways to make it....I only make chicken/sausage, so I don't know how it would differ from seafood...and it's very simple but good, however part of that is tied to the smokey sausage I use. Water, roux, chicken, (heavily) smoked sausage, onion, green onions, Slap Ya Mama or similar seasoning, chicken bouillion, a little garlic powder....sometimes some Emmeril's Essence...just add whatever you think it needs to taste good, better, or right.
Probably better to let someone with a seafood recipe give you the answer you need. lol
You may also want to try a couvillion dish...I've heard it's very good, but haven't tried it.