Boats & Accessories
Don't spend a fortune on a PFD, or Personal Flotation Device, commonly known as a life preserver. Unless you plan to go far offshore in deep water, you will never need it or wear it. Most of the places I go, self-rescue would be a matter of standing up, or a couple of strokes to shallow water or the shore.
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Your new boat probably came with a paddle. I've never seen a boat come with a good paddle. It is just a starter, to get you going. Get a good paddle that is the right size for you. It will make a world of difference. Keep the old one for a spare. Rule of thumb: your paddle should be about your height. If you install a thick seat cushion, you might want to go a little longer even.
I regard my paddle as an emergency signalling device as well, which is why I like the yellow color pictured, especially if your boat is some camouflage shade of green.
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This is a scupper cart. It is a set of wheels that fits in the scupper holes of the kayak and lets one person wheel it around like a wagon. The big advantage of this sort of cart is that when you get to the water, you can pull it out, flip it over, and stick it in the top of the kayak. Then off you go - no need to double back to put the cart away. Also, you'll have it if you get somewhere that you might want to portage.
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This is for sit-on-top kayaks with closed hulls. Open-hull sit-inside kayaks don't really need hatches.
You can order any kind and size of hatch on eBay. They are easy to install - just trace the hole on the hull and cut it out with a jigsaw. A hatch like this one has a storage bag for small items like keys and phone, which removes for access to the inside of the hull.
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First of all, if you're going to be a sailor now, you'll have to learn that it is called "line", not "rope".
More: A Piece of Rope ...