Think fury is quite bad for lvling, compared to arms and prot, so should sell back the 1 Reaper if you still can for JP.
I always prefer dps spec over tanking, so will go with go arms, even tho in many cases tank spec can pull faster and more mobs while lvling.
Since you are lvl 43, about the tanking, you will get Blood and Thunder (
http://www.wowhead.com/spell=84615) at 46 which will make tanking trivial, so shouldnt worry about that part rly. Also it will help a lot for aoe killing of packs. I know it may seem like not much of a skill, but it changes a lot when you get it. Since atm the idea of using TC for aoe is to spread DW which is the thing that does dmg/holds aggro and not the TC on it own.
And for rage starved etc., its hard to rly give you x rotation, just use MS when off cd, use VR and then rly up to you to choose what to use, depending on mobs hp after those 2 hits. If you know slam will be 90% dmg overkill, dont use it use overpower etc.
[Edit] And also dont use execute on normal mobs untill you dont reach lvls in which it wont be 99% overkill dmg, since its a huge waste of rage. Not saying you are using it, just a tip. You can start using it ones the dmg it does wont be an overkill, again thats up to you to determine when, since dont rly remember when is the break point. My best guess would be around lvl 81, since at lvl81 you get Sudden Death, which makes your next 2 OP free after execute, so that helps a bit with rage starving. Could be wrong ofc.
[Edit] I might be wrong here, but what proc are you talking about that includes Heroic Strike as Arms. Only proc that effects HS and i can think of is Prot only.