Just a sugestion i always do to new ppl. Before leveling your main job level up all others jobs to get this skills:

Arc 2 > Decoy
Lnc 14 > Invigorate
Mrd 6 > Bloodbath
Pgl 6 > Fatherfoot and Second Wind
Con 18 > Cure, Protect and Raise
Gla 22 > Sentinel

This skills are must have to play. Also leveling all classes at the begging is nice to see which one you like as your main.