Big questions about pvp,pve gear

First of all i need to know about arp,i cant find a good information...i need a clealry,simple and direct answer about this,i hate complicated answers with 1000 words

This stat is only for pve?
How much i need to unleash the true power from it?,is enough 1200 or i need 1400?
For pvp is realy useless?,or is good for some classes?

Now about pvp gear

What is with truly the best pvp gear here?,Wrathful or Sanctified?
By my logic can be Sanctified when you reach 25% dodge and parry 25%,is enough to avoid big big dmg,but dmg in pvp may be weak idk here
And about resilience...looks powerful as well to have it from what i see,but how much you need for top pvp?

Im just a noob in this game,i dont have time to play and i bought this big boy
http://armory.warmane.com/character/...ecrown/summary
Is it worth this big boy in pvp? or i will be top pve?
I like alot 1v1 this is my style
Dual frost or unholy with Shadowmourne for 1v1?

Thx alot for who can answer this :D