This post will contain most of the basics about UH pve
I'll post best in slot gears/talent builds/stat priors/rotations/how to bind.
Simple Stat priority
Strength > Hit ( 8%) > Haste > Mastery > Crit > Expertise

Talent Spec(s)

http://wowtal.com/#k=xNvv94Nh1.bqj.deathknight.-8SLwh - Raid Dps UH used only when your raid already has enough/a lot of strong defensive cooldowns

http://wowtal.com/#k=xf24PStk1.bqj.deathknight.-8SLwh - Raid Defense UH DPS [Used for heroic magmaw/omnotron HC & Non HC/Cho'gall/V&T/Chimaeron

Binds
Unholy is no complex spec with a complex rotation that wants to ruin your life.Unholy is a spec with exactly 4 buttons
Basics:
Scourge Strike - Used only when you have 3 diseases up - You want to bind it on your most spammable key [mine is 2]
Festering Strike - Use it to convert frost & blood runes to death runes and use Scourge Strike [you want to bind it somewhere close to SS]
Death Coil - Your top damage ability,use it always when you have a sudden doom proc/all runes on CD or when you're above 80 RP [You want to bind it somewhere comfortable to spam-click it.
Outbreak - dots your target with blood plague & frost ferver - use it when you can't keep your dots with festering strike anymore - bind it on a key where you usually bind rapid fire for instance

Advanced:
Dark Transformation - You should keep this on your pet as much as possible,increases its dps by around 1-2k and enhanses its abilities uses 1 UH rune [use it after 2 festering strikes] - bind it on a close key to your movement
Death and Decay - Does more damage than SS,but needs an aim - always have it on CD,unless you have to CC targets - bind it on a comfortable key [pref shift+X/W]
Pet Control - Use the standart [control+1-9] keys or make various macros to control your pet
Unholy Frenzy - This is a tricky buff,but to keep it simple use it on a feral druid or a warrior if they have more DPS than you as it enhanses them more than it enhanses you. - macro it with potion consume etc or macro it to your guild warr/feral:
#showtooltip Unholy Frenzy
/cast [target=Sindragosza] Unholy Frenzy

If it doesn't work try:
#showtooltip Unholy Frenzy
/target Sindragosza
/Cast Unholy Frenzy
/TargetLastTarget
Summon Gargoyle - Use it during a trinket proc/during timewarp/after you drank a potion etc. [It's a good thing to pop all your CDS in the very beggining so you can have them ready in 3 minutes when the boss is at around 50% hp]

Army of the Dead - Use it in the very beggining - This is a super strong cooldown that increases your dps by around 3k and shouldn't be bound anywhere[you can do so if you want tho.]

Horn of Winter - Have this bound somewhere you tend to click a lot

Anti-Magic Zone - Use it when your raid needs a strong defensive cooldown against a strong boss ability - Chimaeron Feud/Maloriak Flame/Magmaw Heroic shadow blast thingies.. etc

Basic Rotation
Outbreak > X2 SS > x2 Fest Strikes > X6 Scourge Strike > X2 SS > X2 FS [read about death Coild above]

Advanced Rotation
Ourbreak > D&D > SS > FS >FS > Horn > > x6 SS > DC Dump > Dark Transform
|||||||||||USEFUL ADDON FOR NEWBIES||||||||||| - http://www.curse.com/addons/wow/clc-dk/514232


Donation only Best in Slot [reforge assuming ur hit/expertise capped]
Hit needs 8.00
Expertise needs 26.00

Helm - http://www.wowhead.com/item=59359 - Haste + Mastery 54 str 3 crit dmg
Necklace - http://www.wowhead.com/item=65025 - Reforge Mastery to Haste
Shoulder - http://www.wowhead.com/item=65183 - 40 str + therazane enchant
Cloak - http://www.wowhead.com/item=65117 - Tailoring Enchant > 65 crit reforge crit > mastery
Chest - http://www.wowhead.com/item=65179 - 40 Str + 20 str & 20 hit + 20 stats ench Reforge crit > mastery
Wrist - http://www.wowhead.com/item=60228 - 40 Str & 65 haste ench Reforge crit > mastery
Gloves - http://www.wowhead.com/item=65180 - 40 str & 50 str enchant don't reforge
Belt - http://www.wowhead.com/item=65040 - x2 40 str
Legs - http://www.wowhead.com/item=65182 - x2 40 str > 190 AP 55 crit reforge mastery > haste
Boots - http://www.wowhead.com/item=65075 - 40 str & 50 haste enchant
Ring1 - http://www.wowhead.com/item=60226 reforge crit > haste
Ring2 - http://www.wowhead.com/item=65106
Trinket1 - http://www.wowhead.com/item=58180 [you can buy with valors 1650] - Reforge to Haste
Trinket2 - http://www.wowhead.com/item=65118
Relic - http://www.wowhead.com/item=64674 40 str gem
Weapon - http://www.wowhead.com/item=65003 - Reforge crit > haste & enchant with Fallen Crusader

http://imgur.com/a/SofIW - My proggress so far.
http://armory.molten-wow.com/charact...sza/Frostwolf/ - Armory
P.S. Don't play unholy unless you have at least a 359 weapon.
PP.S. If you are going to donate make sure you get Ashkandi > Shoulders > Crushing weight as first items,then check where the hardest bosses drop the other bis and buy them first.
Protip - [twilight council/sinestra/Atramedes/Omnotron are hardest]