in all honesty - don't play that game. the ability to spend real money to advance yourself in the game ruined the economy and any original recognition you might of received for getting to a certain level. not to mention that theres no pvp, the whole game is about mindless grinding, scamming, and constantly upgrading your equips to alleviate the grinding.
anyways as far as worlds go, scania is the oldest with the most corrupted economy and highest population (been out since beta) and the furthest one away from scania is the newest. also, "secondary stats" in that game are useless, so if you start off as a thief for an example you should try to roll for a 4 in STR and INT so you get higher DEX and LUK values. if you have any questions about that game i can answer anything that wasnt added after 2008
all my characters and friends played on bera.
76 hermit
54 assassin
42 hunter
bunch of random lvl 30 and lowers