In a large stock pot or Dutch oven, sauté sausage over medium heat until it's starting to brown. If your sausage is precooked, it will take about 5 minutes. If it's not cooked, it will take about 15 minutes. Remove from pot to paper towel-lined plate.
If you are watching your Sodium intake, use reduced sodium or homemade chicken stock, no-salt-added tomatoes (or fresh), and you may want to leave out the added salt. Also look for a low-sodium brand of sausage.
If you don't like your gumbo spicy, use a mild sausage and leave out the cayenne pepper. If you want spicier gumbo, add in chopped chile peppers along with the bell peppers.