I have been asked a few times recently on how I play the priest class, the talents I chose, the gear I pick, the gems and enchants I use. While there is no perfect answer there are a few simple rules that I use to help me be the 2nd greatest priest you know. Today I'm going to cover the first phase of making sure I end up 3rd on your list, that is your talent choices.
Right, you rolled a priest and got it to level 10, the UI is now shouting loudly at you that you must pick talents. This is your first real choice as a priest and one that we all know you're hovering your cursor over on the far right side ready to click shadow, and sure that is a real good DPS spec for levelling, but you know that no one likes a shadow priest as much as they like a healing one so resist that urge, Shadow can come at level 30 when you get dual specs. You need to feel the joy of levelling as a healer and really the first 20 levels will be so fast and easy there is no excuse not to do the healer thing 1st.