I Need Some Advice

hey there /r/wow!

i have been playing WoW quite a bit in the past, but when school started to require some actual studying, i quit. now that i've passed finals, a buddy and me want to start playing again. we would like to reroll a char and do mainly PvP. i would love to get some opinions to the following questions:

* which realm can you suggest? we want to play Horde, on a PvP server in EU. we are germans but that doesn't matter i guess, we are able to use the english language quite well.

* which classes are strong duos for PvP? i hear rogue & mage is strong, or rogue & shadowpriest (i am almost certain to play a rogue)

* 2 dps or heal/dps?

* and a rogue specific question: are undead racials or orc racials better for PvP?

thanks in advance!