u can play the game for free, fully free.
with a decent strategy and sticking to it, u will never have to pay for anything.
Just be decent in the game, help where u can, and be nice to other people.
Like this, u will quickly make friends and maybe get in a decent clan, where u will level pretty fast.
Leveling also means items. U will get some drops, decent and good. All u have to do is, know how to handle the items and coins u have in your possesion.
After a while, u will end up with decent gear (lets say chittins +3+4) and a level 5 weapon +3+4 (mirage dagger, iron crossbow, glave,...), just keep leveling.
Try to know which monsters has the highest rate of drops and coins. (collecting goblin armor is popular, since its easy to kill and it drops lots of coins and goblin armors that u can sell for 35k very easy)
Now this all is for the patient player

if u dont have patience to collect money for Chittin Shells and Raptors/Iron Bows/Shards... and if u think that leveling goes slow,
then maybe its a good idea to buy E-points that u can spend in the Power Up Store in the game.
U can buy weapons and u can buy gold, and u can buy a premium membership in the Power Up Store, which makes u gain more experience (20%) and when u die u lose less experience then normally.
So its really up to u if u wanna make this a free game or a pay to play "decent"