I would say in solarose....(what i do with my test char....all the times. But depend on your build, you may feel this guide a bit different compare to your playstyle.)
First one..hit the bunny or butterfly....woot u r level 17.
Change to first job, let say dealer. Use /class dealer
put your appropriate stat.....believe me, with quadstat features, you gonna have pretty much click to pump stat. So...as dealer, put con mainly and some sens.
go to go 2 to buy guns and bullets. Even the most newb gun will do. U dont need much money at this stage. Money will flow at higher lvl stage.
then, /go 8 and kills some beetle. ---- woot ....lvl 25 already
change class to second class let say artisan. Use /class artisan
then, assuming your character name is Superboy, type /allskill Superboy. Relog to gain all the skill appropriate to Artisan. (Some player ask me, what is relog, well, relog is Log out from the server, and log in back.
now, your character (even at level 25), already second job and has all the skills for second job. Your char now really powerful, combine with 4x stats and 4x damage.
/go 9 to kills some Aqua, untill they name become green or blue color.....
then jump to /go10 to kill those monkeys....until their name become green.
jump to go 11 to kill those crawfy .....by the end of your journey there...your lvl should be around 80.
go to go 12 (GoS), to kill the rock golem until your lvl around 90ish
go to go 15 untill your lvl become 110-120
go to go 37 to kills those pumpkin, then when you can (very good for party), kill those mini boss scorpion and jack pumpkin. You may end up here at lvl 160
go to go 5 (xita ) and start killing pincers...until they give you no challenge. Keep moving across the map...
go to marsh of ghost...and finally...prison.