Basics for good gumbo?

I'm making my boyfriend some gumbo since he is having sinus problems and thought this spicy soup could open him up. What are the basics for gumbo? Like I know around portion size for meat and veggies but other things? I've heard flour is needed, why? (Not that I'm questioning just curious, really.) He... show more I'm making my boyfriend some gumbo since he is having sinus problems and thought this spicy soup could open him up. What are the basics for gumbo? Like I know around portion size for meat and veggies but other things? I've heard flour is needed, why? (Not that I'm questioning just curious, really.) He loves shrimp, beef, and pork so that will be going in just in case that information could be of use. (p.s. We just love spicy.)
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