The story quest forces you to choose a faction, if you want to continue and learn skills. Faction pve and pvp are blended, the only difference is you wear a uniform in order to kill opposing field bosses. This is the true nature of ow pvp. If the server pop isn't too high, both factions can pick a channel and farm the field boss for the 160 insignias needed for Moonwater arena. I spent 1-2hrs and got my 160 plus another 100 for the epic uniform. It's mostly mindless field boss grinding. Prestige comes from killing players and remembering to upgrade before taking off uniform or dying.