With your stats now, you should be able to start running some heroics - at least the easier ones.
You can run H Nexus and get a helm from the 2nd boss? (the mage that splits into 3 during the fight). You should also be able to do H VH and try for the legs from the last boss. H VH is very easy as long as you know all the bosses in there.
Save up the badges and get some gear from there ... I would suggest the neck first which is only 25 badges.
Get Wyrmrest revered for a chest upgrade ... I also think there is a chest reward from HoL or HoS reg that you can get in the meantime that is decent. Work on Argent Crusade as well for the head enchant.
Replace the Horn of Argent Fury trinket - there's a Def one from HoL and a block one from VH (both reg) that will be upgrades for you.
All in all, you look to be on the right track as far as gear goes.
As far as your spec, I would move one of your Ret pts into Improved Judgements so you can use the 96 rotation.
You'll get better and better at tanking the more practice you have ... If you know a good healer, try to pair up and get a bunch of runs going just to get used to tanking.

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