Warlock pvp is very complex and strategic. I will be going over affliction locks because this patch has pretty much made destruction dead.
Afflic locks greatest power is getting dots rolling on every target while using every shadow trance proc and searing pain or life draining while dots are on everyone.
Basics: Some basics are when your fighting melee cleaves always use demon armor the +healing and more armor always help your healer to keep you alive. Portal placement is very key. I don't have any videos as of now but if you want some i can show you and ill make a video. Always yous a felhunter have a devour macro for everyone on your team and your enemy. Have focus fear focus corruption focus curse of agony focus banish focus death coil. I'm probably missing a few but message me if u need some more help on macros.
Intermediate: When you are facing a druid and u see that innervate go off you gotta spam devour that druid i know its on 8 second cool down but you gotta mash that like no other. or u see a lock cast Fel domination devour asap. Some other things if you are playing affliction you gotta rotate your fears accordingly. if you have dr on your fears on both enemy your doing to much if you never have dr on 1 target your doing to little. one thing that helps me is i fear player 1 for full duration he trinkets i don't automatically put him back in a fear if we are about to kill something i blanket silence roll dots then fear by doing this your giving your dr some cool down time i believe its 21 seconds till you start totally fresh and have full duration up again. but by doing this u cast fear wait for the 5 sec duration to be up then u switch to the other target (these are great times for a switch cause u can lock a dps out of a game for about 17 seconds just with fear.
Hope you enjoyed ill have a advanced section come out later this week if you want more quicker just pm me on here.