But RO is one of the hardest game to grind exp.
Mana and HP pot arent cheap.
and you know that to grind high level monster usually you need a solid party.
If you died ,you literally lose 10%
and i can assure you that 10% exp @ high level would take 1 hour to get it. or maybe more
So in that hour , you died because of lack issue. Probably get frustrated and quit the game.

I play full support priest til 72. The only thing u need is be good, talk to people, and make ur own party. I meet lots of people, good people, good player along the way. Till i realize i never be rich if i play only one char. So i make a dex assassin, just to farm. SO this is my conclusion:

1) Never make vit knight, fs priest as ur first and main char.
2) Agi knight is useless. I mean, what they wanna be? Farmer? Hunter and Sin better. Tanker? Go to hell. WOE? Useless. PVP? Goodbye.
3) Sin with "steal", high dex, if u go orc lady farm cyfar, u'll be millionaire in no time

Kbye