Return of Reckoning

I'm new and have been looking into WL (don't like the pet aspect that much), WE, SW and Sorc. Which class IG has the best 1v1 or just st burst in general? I like to blow a single person up.

I played when the game first came out, but I'm new to this version of the game. Two questions:

Is there an instant/quick level-up thing so I can RvR with everyone now or do I have to grind one out?

Is there only one server? I wanna make sure I'm playing where others are.

Bonus question, what kind ...