Patch 3.2 brought some changes for us rets. These are some simplified points on what to do, use and get for us rets.
If you only know what I write here you'll only have a rough idea of what to do. But not why you're doing it.
This is a shameless copy/paste "guide" with pieces taken from all over the fantastic world wide web.
Oh and by the way, this is for PvE. I don't do PvP, I suck at it.
1. Seal
2. Gems
3. Enchants
4. Stats
5. Spec
6. Glyphs
7. FCFS
8. Consumables
1. Seal
The general idea is to use Seal of Vengeance/Corruption for single target fights lasting longer than 20 seconds, due to building a stack and so on.
For fights lasting less than 20 seconds use Seal of Righteousness.
The reason for this is that it takes about 10-12 seconds to build a stack with SoV and about 8-10 seconds for your dps to catch up to what 20 seconds of SoR does. After 20 seconds SoV pulls ahead by quite a bit.
2. Gems
Meta slot: Relentless Earthsiege Diamond
One of these: Nightmare Tear
Every other slot: Bold Cardinal Ruby
The jury is still out on the question about how much strength a socket bonus has to give for it to be an advantage to use a Inscribed Ametrine.
Don't gem for hit, agi or anything else equally stupid.
3. Enchants
Head: Arcanum of Torment
Shoulders: Greater Inscription of the Axe
Chest: Enchant Chest - Powerful Stats
Cloak: Enchant Cloak - Major Agility
Bracers: Enchant Bracers - Greater Assault
Hands: Enchant Gloves - Crusher
Legs: Icescale Leg Armor
Feet: Enchant Boots - Greater Assault
Weapon: Enchant Weapon - Berserking
If you're under hit cap use Enchant Gloves - Precision and/or Enchant Boots - Icewalker. With the abundance of hit available on gear this shouldn't be a problem.
4. Stats
First get hit capped. Which is 263 without a draenei and 230 with one.
Then get 16 expertise. Which is 131,2 expertise rating. You get 10 expertise from your Glyph of Seal of Vengeance
Then stack strenght as much as you can.
Crit isn't bad either.
5. Spec
This works fine: 5/11/55
6. Glyphs
Major:
Glyph of Seal of Vengeance
Glyph of Judgement
Glyph of Consecration
Minor:
Glyph of Sense Undead
Glyph of Lay on Hands
7. FCFS
We don't have a rotation. Hit whatever is off CD first. Here's a simple priority list for you:
HoW > CS > Judge > DS > Conc > Exo
Remember that Hammer of Wrath only is available when your target is under 20%
Remember that Exo is on a cast time, but becomes instant with Art of War proccs. Only cast it when it's instant.
8. Consumables
Flask: Flask of Endless Rage
Food: Dragonfin Filet
Fish Feast works just fine when someone's throwing one out.
I don't explain everything. There's more in depth guides out there doing that.
Have fun.
Edit: Added "single target" to the Seals part about fights lasting longer than 20 seconds.