New to the game here.

I've been reading and coming across people displaying leveled up rank (DoM / DoW / DoL, etc.) and wondering how they do it?

I'm currently a gladiator (DoW), how do i level up DoM (tha) cz i heard that gla / tha is a decent build.

Since i'm under "fightng" discipline, can i rank up the other jobs under the other disciplines? Is there an NPC that teaches you to rank them?

hope someone can give me a reply here cz i've been trying to read around and look for the answer myself but no luck... haha.