1) Gearing your warlock:
If you are a fresh 85, you don’t have any pvp gear and so I recommend you purchase some pieces of BoE pvp gear (vicious gear). This will increase your resilience considerably and allow you to live for much longer when attacked. When you have obtained some pvp gear it is time to enter random battlegrounds and grind honor points. You want to purchase the entire 390 ruthless honor set whilst accumulating cataclysmic pieces as you go. I would purchase the helmet, chest and shoulders of the cata set first as they will not drop from BH. The rest of the cata pieces have a chance to drop from BH so its in your best interest to buy them after purchasing the 3 above pieces. For your cloak piece you want to get the cloak of diffusion, that is the cloak that has spell penetration on it (more on this later). You also want to get the belt of accuracy and the boots of alacrity. Bracers can be preferential however I prefer prowess. As for trinkets, everyone except humans should pick up a Gladiator’s Medallion of Tenacity and an onuse trinket, Badge of Dominance. Also, with the prevalence of PvE gear in PvP, you can use Dragon Soul trinkets and weapons over the regular PvP items but more on that later.
2) Gemming, Enchanting and reforging:
Now that you have obtained some pvp gear you should optimize it. By this I mean add stats to it that your warlock prioritizes.
Helm: Arcanum of Viscous Intellect
Shoulders : Greater Inscription of Viscous Intellect
Cloak: Greater Intellect > Intellect
Chest: Mighty Resilience > Peerless Stats
Bracers: Mighty Intellect > Speed > Precision
Gloves: Haste > Mastery
Belt: Ebonsteel Belt Buckle
Legs: Powerful Enchanted Spellthread > Any lesser spellthread
Boots: Lavawalker > Earthen Vitality
Weapon: Power Torrent > Hurricane
Offhand: Enchant Offhand Greater Intellect
Keep in mind that some of the enchants are quite expensive and if you are low on gold you can chose to not enchant your gear or chose a lesser enchant if the selected one is too expensive. Personally I recommend choosing a lesser enchant for the ruthless gear as it will be replaced soon enough, this means you don’t have to choose top of the line enchants. The above enchants are just the BiS enchants for those who want them.
Reforging: You want to reforge to full haste. Contrary to popular and INCORRECT belief, mastery is not best for affliction warlocks, haste is. Reforge everything to haste, prioritize reforging out of hit into haste over other secondary stats.
Gemming: As a general rule of thumb you want to put brilliant inferno rubys/ brilliant queen’s garnets in red sockets. You want to put willful ember topaz/ willful lava coral in yellow sockets. As for blue sockets you want to just put red gems in them unless you are under 4% hit chance, in which case you want to put Veiled Shadow Spinel / Veiled Demonseye in them until you reach 4%.
The stat priority for warlocks for those interested is: Hit to 4% > Intellect > Resilience > Haste > Mastery > Crit. (If you pick up the diffusion cloak, you don’t need to worry about spell pen).
3) Specs and Glyphs:
This is the most common and best Spec/ Glyph combination for Affliction PvP:
If you have questions as to why a talent or glyph takes precedent over others ask in the comment box and I or someone will answer your question.
4) Key Binding and Macros:
Warlocks have many skills and abilities, and to play the class to its highest potential its imperative to keybind all of your abilities even if you don’t plan on using them in the immediate future. It will only help to keybind your abilities. For this section I am going to link [Simplexity@Korgath]’s Keybinding guide as I believe that it covers many important issues and is very well done, and typing up a guide for it would just be redundant. All credit for this section goes to him! (He also has many other PvP guides check them out!).