Holy PriestsFollow

Hey peoples, First time on this forum. As my main is a Holy Priest I would like to discuss about the class this is mainly towards raiders.
a little bit of background I am/ was a hardcore raider I started at the start of TBC and loved the expansion so much carried on hoping for the excitement to come back when done SSC or BT. I have yet to find it I have done 8/8 DS heroic etc... but haven't had the time to raid MOP so far ( Work commitments) will start with my guild as they are doing heroics but need to get some gear first. I was wondering how hard as a Holy priest or other healing specs do you find it? And whats your rotation etc... I like to know diffrent skills, Glyphs strategy to better myself.

Thank you.