you go for a 1handed SoR spec/playstyle like the one developped by Saphael using Ironfoe:
SAPHAEL'S 1HAND SOR RETRIBUTION SPEC
If you would prefer to follow a more hybrid playstyle and gearset, there are two additional ways of gearing up and doing damage. Both of these require that you use Seal of Righteousness instead of Seal of Command and would therefore necessitate a different talent spec.
Full credit to this 1hand Spell Damage gearset and play style goes to Saphael.
13 / 8 / 30 - RET SPEC
ABBREVIATIONS
Seal of the Crusader: SotC
Seal of the Righteousness: SoR
Judgement of Seal of Righteousness: JSoR
Judgement of Seal of Wisdom: JSoW
Out of mana: OOM
Spell Power: SP
Attack Power: AP
MP5: Mana per 5 seconds
MP1: Mana per 1 second
One Hand: 1-H
GEAR (BiS-preraid):
Helm: Soulforge Helm - Lesser Arcanum of Voracity
Neck: Beads of Ogre Mojo
Shoulder: Soulforge Spaulders - Zandalar Signet of Mojo
Back: Cloak of the Hakkari Worshipers - Formula: Enchant Cloak - Subtlety
Chest: Soulforge Breastplate - Formula: Enchant Chest - Greater Stats
Wrist: Battleborn Armbraces - Formula: Enchant Bracer - Mana Regeneration
One Hand: Ironfoe - Formula: Enchant Weapon - Spell Power
Off Hand: Therazane's Touch
Relic: Libram of Fervor
Hands: Soulforge Gauntlets - Formula: Enchant Gloves - Superior Agility
Belt: Soulforge Belt
Legs: Titanic Leggings - Lesser Arcanum of Voracity
Boots: Soulforge Boots - Formula: Enchant Boots - Greater Agility
Finger: Tarnished Elven Ring
Finger: Tarnished Elven Ring
Trinket: Blackhand's Breadth
Trinket: Hand of Justice
GEAR (BiS)
Helm: Avenger's Crown - Lesser Arcanum of Voracity
Neck: Choker of the Fire Lord
Shoulder: Avenger's Pauldrons - Power of the Scourge
Back: Cloak of Concentrated Hatred - Formula: Enchant Cloak - Subtlety
Chest: Avenger's Breastplate - Formula: Enchant Chest - Greater Stats
Wrist: Wristguards of Vengeance - Formula: Enchant Bracer - Mana Regeneration
One Hand: Thunderfury, Blessed Blade of the Windseeker - Formula: Enchant Weapon - Spell Power
Off Hand: Sapphiron's Left Eye
Relic: Libram of Fervor
Hands: Marshal's Lamellar Gloves - Formula: Enchant Gloves - Superior Agility
Belt: Belt of the Grand Crusader
Legs: Avenger's Legguards - Lesser Arcanum of Voracity
Boots: Avenger's Greaves - Formula: Enchant Boots - Greater Agility
Finger: Band of Unnatural Forces
Finger: Band of Accuria
Trinket: Kiss of the Spider
Trinket: Neltharion's Tear
Note: There is other gear combinations for this build (easier obtained pieces).
CONSUMABLES
Brilliant Wizard Oil
Flask of Supreme Power
Elixir of the Mongoose
Elixir of Giants
Elixir of Greater Intellect
Scroll of Agility IV
Scroll of Intellect IV
Scroll of Strength IV
Greater Arcane Elixir
Mageblood Potion
Demonic Rune
Major Mana Potion
Winterfall Firewater
Swiftness of Zanza
Stratholme Holy Water
Thorium Grenade
Cerebral Cortex Compound
Juju Guile
Juju Power
Crystal Spire
Nightfin Soup
Arcane Elixir
Note: Only some of the standard consumables have been listed, if you are going to do 40-mans more consumables is needed.
GAMEPLAY
Your main abilities are Judgement of Seal of Righteousness, Consecration R1 & you will need to have SoR up all the time.
When you are on single target's you will be judging SotC first, then change to SoR (never stop judging SoR, but have SotC up on your target). Always have Consecration R1 up, and never use a higher rank, because you will go OOM. There is possible to use a higher rank of Consecration, but then you should have done the math beforehand to be sure of not going OOM.
STAT PRIORIZATION
I will only calculate my numbers as a Human, so Dwarf paladins is not included in these numbers(Humans and Dwarfs have different stats). Also I will not go into absolutely every detail so hang in there, I'll try to make it as easy as I can.
INFORMATION
This is indeed a mana-consuming build, but in my point of view it's the best and most viable build for an Retribution Paladin. From years of experience in high-end continent as an Retribution Paladin, this is the way to go.
I will calculate using numbers from the BiS-peraid gear, when fully buffed up from the "mini guide" I made above. Also class buffs is included in these calculations.
Indeed, you clearly want the 8% hit.
Afterwards you should concentrate on having enough melee crit to have a fair amount of vengeance uptime(15% increased physical and holy damage). You can easily check how much uptime you have by using this formula: 1-(1-(crit/100))^(8/weaponspeed). In this case it will be: 1-(1-(32/100))^(8/2.4) = 0,72 | You will have an vengeance uptime with 72%. In addition to the 72% uptime from white-hits, you have a judgement that you use every eight second. So that will increase your vengeance uptime.
So that's the formula, but it's not accurate according to my gear-setup. Since you have Ironfoe and Hand of Justice this adds more white-hits, which means that you will have a better vengeance uptime than what you have calculated.
Before you start to think about how much spell power and strength/AP that you need. Take a deep breath, then try to find out how your mana-sustainability currently are. You can check that by doing this:
Mana from abilities pr. min (without any buffs or manaregain)= 90 (Judgement) + 170 (SoR) + 135 (Consecration R1) = 395 * 10 = 3950 | 3950/80 = 49,375 * 60 = 2962,5 mana pr. min.
Manaregain= 76 MP5 | 59 MP2.4 (JSoW) | 156 MP5 (DR, MMP) | 15,2 + 25 + 31 = 71,2 MP1 | 71,2 * 60 = 4272 pr. min. (Take in account that Ironfoe and Hand of Justice procs is not in these calculations, so in reality you gain even more mana (JSoW). I can calculate how much mana you gain with these items also, if you fancy it.
Note: You can clearly see that mana is not an issue if you use consumables.
Spell power is indeed important, since SP is stacking with your abilities (SoR, JSOR, Consecration).
AP is important also, since your white-hits contributes a lot of your total damage, so you'll need to balance these out by using all-stats sets like: Soulforge Armor, Judgement Armor, Avenger's Battlegear.
Stamina is self-explainatory.
I can get more into spirit another time if it's desired.
SUMMARY
Priority order: Hit - Crit - Mana - Spell power & AP - Stamina - Spirit
Note: crit and mana is something you'll need to calculate as mention above, so when you have enough to be sustained, the other stats will of course be more of importance.