Need help with my Warlock on WoW?

Well I have a lvl 80 warrior but i decided to lvl up a warlock. I really don't know a lot about them so what stats should i be looking at with a warlock - (stamina, intellect? ect) also - I havent decided for a talent tree yet. Which would be more beneficial when i get to lvl 80 raids? thanks for the help and info