The first post at the top of the page is
Sticky: [Priest] Guides, Important Threads & Rules (READ BEFORE POSTING).
If you'd read it before posting you'd have found references for lots of useful, enduring, commonly requested information (hence why it's stickied), such as
[Priest] PvE Discipline Priest Guide which would have provided you a lot of information about the general decision process in designing your tree dependent on your role in raid. Your question is very general and is answered therein, so really shouldn't have spawned a new thread.
If you want to argue the merits of some of those decisions, the best place is within that thread so that if edits are deemed appropriate they can be made in the reference material rather than repeated a day, week, or month later in one new thread after another. If you have a more specific question not reviewed in that or other referenced threads from the stickies (or directly in the stickies themselves), such as refining a spec for a specific encounter or other unique considerations then that's the place for a new thread.
Not trying to flame you, as I understand you're simply looking for more information and advice, but I think you'll find a lot of what you're looking for in that thread. If you do have more detailed followup, please try to provide as much background information as possible, such as your role in raids (are you primarily healing tank or raid), size (10- or 25-man), difficulty level (5-mans, normal or heroic raid), armory link, and anything else that might be relevant to help others understand your situation.