Hi and welcome. There is no 3rd job implemented now plans to do so, because well they are too unbalanced at the moment and it would take time to individually set them up. As for the Poring Rebels, those are pretty impossible to kill if you're character is not geared. Please refer to the "Gettin Started Guide" that is offered right here in the forums, it is a very good basic explination of the core points in this server and how to get started towards your road to endgame.