Welcome m8...!
I remember running an 10-man ICC with you two weeks back and we had a lot of fun. Nice to see you decided to join Sín. It's a great bunch of people and I am sure you will have a great time.
Unfortunately you logged out in tanking gear, so couldn't take a look at your healing kit. For your talents I would consider how often you really use Divine Sacrifice in a raid. If ur not too hot on it, I would consider resepeccing and get at least 15 talents in Retri to get the "Conviction" talent...maybe even 18 talents so you can add "Sanctity of Battle" as well.
But since I am just an OS nooby pally healer, maybe someone who really knows what he/she is talking about could give you some advice on that.
Anyway....welcome