Black Mage is a fun job. I main'd monk and swapped between that and dancer a lot. Was planning to Max level all my classes at one point but got distracted after Endwalker. If you want Black Mage, start at the Thaumaturges guild in Uldah! You'll need to unlock the job at a higher level, but Thaumaturgist is the precursor class! Can't get to it without em. Also- any time you get an opportunity to do a class/job quest- do it! It sometimes unlocks new actions/moves :D Good luck and have fun in Eorzea! Edit: Also, don't discount Materia- I went my whole playtime without using it, and that was stupid because it gives little beneficial edges in fights.