I'm not overly familiar with this game, especially about the class system. I know that u can pick up a second class which will then turn your class into something else, say white mage. But my question is do I have to do this to be usefull for raiding, or can I go with just the base class, say conjurer(I think that's what its called).
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The job is a specialization of the class. You don't have to do it, but I have not seen anyone in the game not become the jobs associated with the classes. It is just something you do and is a natural progression as you play the game.
To open up the quest line for a job, you need to become level 30 in the main class and level 15 in the secondary class associated with that job. As an example, to become a white mage, you will need to level up conjurer to level 30 and arcanist to level 15.
As for raiding, yes, you will want to be the job. The better gear in the game always tends to be job specific.
The moment I read "It's like" or "WoW" is the moment I stop reading your post.