Stat Priorities
Stats Ranking
Haste = Versatility > Crit > Mastery
Stat Outline
As always for your stats, enchants and gems: Some of them might be better than others depending on your specific gear or talents. Make sure to always sim yourself if you want to know the best combination for your gear.
Agility: Raw damage increase.
Haste: Increases attack speed and reduces the cooldown of spells like Blade Dance or Immolation Aura.
Versatility: Increases damage done and reduces damage taken.
Crit: Increases the chance of your spell doing double damage.
Mastery: Increases chaos damage taken and movement speed. Don't play with it, mastery scaling is not good.
The best way to calculate stat priorities for your character is to "sim" your character
Find out how to simRaces
The only available race for Horde is Blood Elf and for Alliance it is Night Elf.
Enchants
Weapons: Celestial Guidance in every situation. The other weapon should have Sinful Revelation for single target damage or Lightless Force for AoE Damage.
Cloak: Fortified Leech or Fortified Avoidance
Chest: Eternal Skirmish
Boots: Eternal Agility
Rings: Enchant Ring - Tenet of Haste or Enchant Ring - Tenet of Versatility or Enchant Ring - Tenet of Critical Strike
Gems
Quick Jewel Cluster or Versatile Jewel Cluster or Deadly Jewel Cluster
Consumables
Flask: Spectral Flask of Power
Potion: Potion of Phantom Fire for Single Target or Potion of Spectral Agility for AoE.
Food: Tenebrous Crown Roast Aspic or Steak a la Mode
Weapon Oil/Stone: Shadowcore Oil in combination with Potion of Phantom Fire, otherwise use Shaded Sharpening Stone.
Healing Potion: Cosmic Healing Potion
Armor Kit: Heavy Desolate Armor Kit