Welcome to the server! West Commonlands should be good for you for awhile. Start with killing the blue con pumas, spiders and snakes, and work your way up to the willowisps and kodiaks. You should also be able to regularly snag buffs from people porting in and out of the druid ring (if a level 60 Druid hits you with a full line-up of buffs, you'll basically be able to power-level yourself until they expire). Also a good chance that some kind, established player who's just passing through will hook you up with some hand-me-down items that will serve you very well. The Lightstones and Greater Lightstones you get from the wisps will provide good spell money, and the bear skins can be used for tailoring recipes (particularly the handmade backpacks, which you will want yourself, and which you can also sell for good plat).
And on all your adventures, remember to keep the wiki handy:
https://wiki.project1999.com/Main_Page