What are the best attributes for a Rogue on WoW?

I am a level 19 Subtlety Rogue on WoW, and I was wondering, what are the best base attributes for me to have, e.g. Strength, Agility, Stamina, and what are the best Melee attributes for me to have e.g. Damage, DPS, Haste. All answers are really helpful as I'm not that experienced at WoW, thanks!