Not maxing the starting class

[Frizze]

No need to worry about this. As the others have said, theres no penalty for switching. The game is designed around your character being able to do almost everything so itd be counter-intuitive to put a penalty on people for experimenting after encouraging it. And rogue, in particular, isnt even available as a starting class - it requires you to switch off at some point to get to. The only things you need to level up marauder to unlock are further marauder abilities, the Warrior job(an extension of the marauder so obviously requires it), and the Dragoon job crystal(requires lvl 15 marauder and 30 lancer to unlock). So if you dont need those 3 things(and as a rogue/ninja you probly wont) dont worry about it til you decide you want to go back.

Edit: Almost forgot! Welcome to the game both Eirene and Grant!