Welcome to the Forums man.
As for leveling... Do everything you can, even some collection quests. Is what I do is grab all the collection quests go to the spot and kill a few mobs to check the drop rate. Sometimes its fast. Doing that for 3 characters is or could be better xp that killing mobs on one toon. SUre it takes longer.. But whatever.
Also, get someone to pwr lvl you threw instances. My /played with my 4x shamans is 1day 5hrs at lvl 28. In my opinion that pretty fast.
I have no experience in PVE or PVP yet. So I cannot help you with the second question.
Hope this helps.
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