starting at lvl 1 makes no sense , since in this game classes starts at lvl 1 and jobs starts at lvl 30 , so it would be at least lvl 30 .

although id like it to be lvl 30 since it would mean more story <3 , you could say its an advanced job since its a mix between black and white magic, so you would need to be stronger to equip the jobcrystal, i can even see SE adding something like you need to have black and whitemage atleast at lvl 50 to get access to that job