Don't forget to do your Ixal dailies when you are under 50 - they give a decent chunk of EXP and you don't need any mats outside of what you are given, so it's cheap and efficient. Moogle dailies are the same, and you'll want to do those everyday once you hit 50. GC turn-ins are also something to do each day, and you get double EXP when you turn in HQ requested items.