Stats and your Enhance Shaman, what you need to know.

PVE priority

1. Hit until spell cap of 17% (1742 [1638 Draenei racial]) 
2. Expertise until cap (541 [450 dwarf/orc with racial])
3. Agility  (2 AP and .00307805% crit per point)
4. Mastery (reforge EVERYTHING to mastery once you reach hit/exp cap) 
5. Crit 
6. Haste
7. Hit  (increase damage through offhand white hits)
8. Intellect (minor spellpower and spell crit)
9. Strength (do not roll on STR gear!)
10. Spell Power (possibly more important then str/int but do not gem for it)

PVP stats (priority depends on team comp and play style)

1. Hit until 5% to land melee special abilities and to land those hex's (510 should get you close enough)
2. Resilience (reduces damage by 1% for every 95 points) 
3. Spell penetration (100-130 should negate almost all resistance)
4. Agility (main dps stat)
5. Mastery (most important sub-stat once spell pen is capped)
6. Stamina (1 point stam = 14 hp) got to be alive to win

The rest of the stats will not need to be enchanted or gemmed for in PvP