This is an old favorite of mine. A real cajun taught me a version of this using maui maui and shrimpo. I like shrimp and sausage, so that's what it calls for, but you could use just about anything....chicken...pork...or any firm fish.
Saute some flour in oil, about equal parts, maybe just a tad more flour. I would use 3-4 Tbl each. You want to SLOWLY brown this till its the color of cocoa. This is called a roux.
Next, add some chopped onion, celery and green pepper and a couple of cloves of smashed garlic. This is the Holy Trinity of all cajun cooking. Be sure and stir. It will burn. After a while the onion will become translucent. Then add the sausage. I use Mild Italian, maybe 3 links chopped up. Once this browns add a can of tomatoes or fresh if you have them. I use Rotelle (?) a couple of small can with jalepenos (or one large can regular). Then I add a cup of uncooked rice and about 2 cups of chicken stock. Once the rice is almost done, add at least a pound of raw peeled and deviened shrimp. These only need to cook a little. When the rice is done, its ready.
If you Google "courtboullion" you can find some other verions. The cajun's pronouce it "coubion" (coo-be-on)