Gear Progression

Hello, this is my 1st char, so im kinda lost

I got 80, bought the northrend rep items and started farm hc dungeons, but idk what should i do, so i need help to know which way to go

I'm a ret pala: http://armory.warmane.com/character/...mourne/profile

Should I buy the lost conqueror items with emblem or farm them in raids? Or should I not waste time with them and go straight to conqueror waywards? Which raids should I go to and what order and minimum gearscore to get a group?

*noobquestion: is there a problem using pvp items in dungeons and raids?
*current gs: 3547
*Frostmourne realm