I'm making gumbo for the first time tonight and need some help?

I am from the Seattle area, so making shrimp/seafood gumbo is brand new to me. I have a couple of questions on how to make gumbo. First, is it better to use okra or file powder for shrimp? When you make seafood gumbo what all should I put in it? (I already have the basics like red/green peppers, garlic,... show more I am from the Seattle area, so making shrimp/seafood gumbo is brand new to me. I have a couple of questions on how to make gumbo.

First, is it better to use okra or file powder for shrimp?
When you make seafood gumbo what all should I put in it? (I already have the basics like red/green peppers, garlic, onions, tomatoes, etc.)
Do I put the rice in with all the food or do I cook it separate and put the gumbo on top of it?
Finally, what is a roux? Is it good with shrimp gumbo?

Thanks
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