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I'm also from Mississippi and have been thinking heavily on either using a kayak or rigging up a boat with a blind to use actually on the Mississippi River. I've been trying to do some research on the legality of the subject such as using a boat as a blind, (with the motor off, of course) and how far from the shore you have to be, etc.
As far as suggestions for you, this is kind of common sense but you do definitely not want to wear waiters or any type of rubber boots while out on deep water. You can easily swim in regular knee height rubber boots, but you will not be able to with winter clothes and other gear attached to you. You'd need some warm waterproof shoes though.
As far as clothes go I'd definitely look into buying a nice hunting parka and pants. Waterproof is probably a necessity. They are usually marketed as "4 in 1" systems. Cabelas, Drake, Redhead, etc all the big companies make them. They are usually pretty expensive though, but being out on the water you will freeze your ass off if not dressed properly, even in Mississippi. For a base layer I'd go with wool in the unlikely event that you have an out of boat experience. Fire starting materials would also be a must.
Switching from paddle to shotgun really shouldn't be that much trouble.. just keep the one you are not using across your lap. But maybe have an extra long sling that you put on the shotgun that could go around the back of your neck, but would allow enough slack to shoot.
I'd also maybe consider making some sort of blind for your yak out of PVC and that blind material. Maybe something like a rectangular outline that when you get to position you would just lift up and stick pipe under to hold it up about nose level. It would be kinda like lifting a shower curtain all around you if you can kinda picture what I'm saying. That would be in the event that you're not able to get close enough without spooking I guess you'd just have to use the kayak as a blind and set out decoys.