I also agree with what Celia said. Only thing to add would be to watch wrist cocking and whether that causes you any pain or issues. Some angles make you twist wrists more than others, which could become an issue.
Historically, people said feathered paddles are better as there is less drag in the out of the water blade against a head wind. Most agree that this really is bunk.
In white water and surf kayaking you see more fathered to prevent facial damage. For example, if one was punching through a wave (so a wall of water is about to come over deck) and one blade is making the last push, a feathered out of water (until that wall of water hits it) blade will be less likely to catch the wall of water (and be smashed back into your face).
This all said, I paddle (and I do kayak surf) unfeathered. It is what I have found works for me.
Paddler's Truck Rack
Hardshell Kayak Sail Rigs
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