Arms starts out stronger than fury but fury tends to scale a little better with gear, due to having two 2 handed weapons. That being said the difference is small enough to be pointless so long as you're playing to your maximum potential, so why not take the one you enjoy more? I've never played Arms before but from what I've heard its a much more active rotation than fury.
As for your spec, I see nothing wrong with it. I actually tweaked my spec and rotation based on thegreatme's guide and noticed an improvement. I was going BT > WW instead of the other way around and losing quite a bit of dps. If you're following his guide you're probably doing ok.
Gear/Advice - Best thing you can do right now is get your expertise up as its really low. Once you hit 25-26 expertise skill (214 rating) stack strength and crit and you're golden.