re: Fishing in the marsh

Frozen shrimp can be hit or miss.

Nothing is going to beat live bait. My best suggestion would be to invest in a cast net. If you can catch bait in the area that you'll be fishing there's a good chance that the fish are going to be feeding on that type of bait. Spooky fish will be more inclined to eat prey that is natural to the area.

Bull minnows and finger mullet should be plentiful and easy to catch in the marsh. It's an investment that pays for itself

While feed charts are good to look at, they don't really factor in specific locations. Marsh fishing usually isn't very good at low tide from my experiences. While the fish may be eating, they're probably eating in deeper water. The outgoing tide carries the bait out with it.

Kayak fishing is an addictive beast. There's nothing quite like it. If you have a good comfortable set up you'll enjoy it whether you are catching fish or not, and if you go enough you'll eventually start catching fish