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Which of the level one job classes puts me closest or into Einbroch?
It goes Novice-> Gunslinger. You don't need to change job classes intermittently. Getting to Einbroch isn't a challenge since you can walk and there is a safe route with non-aggressive mobs, or you can take the airship. Although becoming a Gunslinger as your first character can be challenging. I suggest trying out an archer first since its easier to progress and change into an archer.