Here is a small guide to fast and effective XP farming.
XP and Level Farming Guide
We are here at Fort Wyvern, where you can position yourself well on the stones. You now only need a ranged weapon and a lot of ammunition (here it should be said that the loot starts with a new server always spawns, so loot properly).
Now you just have to keep it up, because you get experience or XP for every hit you land. So there is no need to kill, the hit alone is enough. Zombies spawn after 24 hours of in-game time or by restarting the server.