Guys, I think he just needs some direction.

OP, like some people posted here, lvl some other classes for skills such as: Second Wind, Invigorate, Sacred Prism, etc.
Do a research on what skills are at what level, plenty of resources out there. Once you figure out what your main class is build your other classes based on it.

Ultimatelly, lvl all DOW/DOM to 50 so you can get a crown/achievement.

Also, there are DOH and DOL to work on. If you decide to go towards GSM/BSM/ARM i suggest get your MIN up first or at same time, as you will need a lot of ores. If you go for CRP, then lvl BOT as well. BOT especially has a lvl 25 skill that randomly gives you double EXP for all DOL classes.

FSH goes hand in hand with ALC and CUL, although CUL you could level independently. I am no very familiar with WEA and TAN as I do not have mine up very high.

Also, there are class specific quests that become active when you reach a certain level, main quest storyline and a lot of side quests in each city, simply look for ? mark.

Overall, what is your goal with this game? Mine is to have fun mainly, do endgame stuff for personal accomplishments and simply enjoy the beautiful graphics SE is offering us.