Hello dear MMO-champ, chaps!

Me and a couple of friends were planning on making a 3v3 team setup that includes: Death Knight, Priest and a warlock.
I did some research on my own on the arenajunkies ranking system and found out that there was only a few teams of this setup that managed to get past 2000+ rating.
I got curious and asked myself how this could happen so I digged a little deeper for more information, hoping to find a guide or something but to my surpise I found nothing.

So I'm asking you guys for help now:
Talents (we still aren't sure if the priest should be shadow or disc)
Strat
Gear
How far will we make it?
etc.

Also if you have some experience playing with (or against) this comp and you feel that you have some useful information to post, please, go ahead!



(I am so sorry for any bad spelling or gramma that might hurt your eye/s)