1:The PVP here is very balanced. Some classes are stronger at certain things than others but each class definitely is usefull. A cleric, for example, is not the ideal choice for 1v1 fights. They do however shine in mass pvp.
2: This depends. Getting skills to level 10 should be easy. You can run a few PV's and get that done. Getting your sage/demon, 79, 100 & morai books may take a bit longer but it's definitely not extremely difficult. (Morai has been sped up here compared to PWI and the books are tradable.) The gear is also a bit of work but with current prices you can get pre-sharded dragon gear (lvl 150) for about 100 ec. Id say it'd take a few days/weeks at most depending how much you play.
3: There are usually GM's online that can help with questions, if not there's always worldchat.