You look pretty good to start Kara. I would suggest running Heroics and picking up the Heroic Badges Shield and the Autoblocker Trinket. Also, pick up the Sun-Eater while you're running Heroics.
Your spec could use some work, but other then that, you look well-prepared.
Here's a basic spec for tanking raid bosses. Your current spec is already pretty decent for Heroics and 5-mans, but it's inhibiting your overall threat out-put and mitigation.
Obligatory llama dancing naked. Note the equisite style with which he deftly turns his head; the light prance in his demeanor as he lightly tosses his feet into the air.