Im really lost :(

[Niwashi]

I will have to make a new char T.T

No you don't. Just add Thaumaturge and Archer as additional classes along with Conjurer. This game allows you to advance any or all of the classes.

1st: Reach level 10 in your initial class and do the level 10 class quest. This unlocks the ability to add other classes.
2nd: Go to the class guild for the class(es) you want to add and do the introductory "So you want to be a <class name>" quest. This unlocks the new class and gives you a starting weapon or tool.
3rd: Once other classes are unlocked, you can switch between them whenever you like just by changing your main hand weapon/tool.

Note: Your level is specific to a particular class, so if you're a level 10 CNJ when you unlock ARC, switching between a wand and a bow will switch you between a level 10 CNJ and a level 1 ARC. You'll need to level up each class independently (although you do get a 50% bonus to XP when on a class that's lower level than your highest one).