What class do you play?
...
If you're pvping, press all of your most powerful abilities right out of the gate so that they'll be ready sooner, ultimately increasing your damage/healing output over the course of the 30 minute match you're subjected to upon deciding to pvp in Cataclysm.
If you're pveing, go to elitistjerks.com, find your class's Sticky thread, and just do everything they tell you because they're the only people dedicated enough to make sure everything they say about this game is 100% mathematically accurate.
If you're RPing, go to Elune and take off your clothes.
/WoW
I know how to play.
I mained a holy priest from beta up until the last the day of BC and I was on top of all the endgame content.
The elitist jerks priest sticky is super out of date and it doesn't actually explain any of the new game mechanics. There isn't really any point in theorycrafting for me right now.
It's like a completely different game from when I played.
I come from a time when the spirit regen co-efficient was over double what it is now.
OO5SR mana ticks basically gave you an 8th of your mana bar back.