thank you all for replying I appreciate it.
Ok I will try to level each class to 15 as Niwsahi says and see what I can do. I just want to feel that I can earn gil by myself and be self sufficient. And I know it will be a long journey.
But anyway I will try and learn step by step.

Im planning to level 1st my GLA until 30 to get some gils. Should that be ok?

Thanks!