i just got this game yesterday, and i like it very much, but i am really confused about it. i was wondering how people get ninja, samurai, or dragoon, or any of the other extra jobs as their first job.

well first you have to get 30 and then do a quest to get those jobs like
Ninja
Dragoon
Samuria
Summoner
Paladin
Dark knight
Ranger
Bard
Beast master
and
Blue mage
Corsair
Puppet master