When fishing with a spinning reel, which hand do you reel with if you are right handed.?

I am not asking this question for me, it is for a guy I work with that uses it backwards. He is right handed and argues with me that Everyone else is wrong and not him. I am not talking about a Zebco or a baitcaster reel. I am talking about an open face spinning reel.

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How do I pick the right Fishing Rod and Reel?

I want to get back into fishing. Haven’t done it since I was a kid in Idaho.(And miss it dearly, I was pretty good at it.) Now living in Nevada. I know some spots in my area that have bass and trout. And I what to go back to Idaho and fish the Snake River for Catfish.
How long of a fishing rod do I need?
What kind of fishing reel?
What kind of fishing tackle do I need?
Any comments and/or tips about the subject would be a huge help
Thanks

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