im new to tanking 5 man heroics and raids
Overload on mastery. The other stats will come with improved gear. Learn what combat table coverage (ctc) is and make that your goal. Higher item level is not always better. Not at home so I can't see your talent but most of the self heal ones are weak.
Edit for clarity:
If the socket bonus is a tank one, try to get it with a mastery or mastery hybrid gem (mastery+stam or mastery+parry). Reforge to mastery if it's not on the piece. Reforge to balance dodge and parry if the piece already has mastery.
"he doens't need healing, he doesn't need healing, he doesn't nee-WHAOSHIT!wtf was that man!". Please stop leaning on TDR. -Teng