Authentic New Orleans Style Gumbo

Name: Authentic New Orleans Style Gumbo
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: American
Ingredients: 1 cup all-purpose flour (, heaping); 2/3 cup oil ((vegetable or canola oil)); 1 bunch celery (, diced, leaves and all); 1 green bell pepper (, diced); 1 large yellow onion (, diced); 1 bunch green onions (, finely chopped); 1 bunch fresh chopped parsley (, finely chopped); 2-3 cloves garlic; 1-2 Tablespoons Cajun seasoning (*); 6-8 cups chicken broth (*); 12 ounce package andouille sausages (, sliced into 'coins' (substitute Polska Kielbasa if you can't find a good Andouille)); Meat from 1 Rotisserie Chicken*; 2 cups Shrimp (, pre cooked); hot cooked rice (for serving)