So i leveled ninja to 60 with no crafting class and with BLM getting close to 45 I'm getting tired of all this materia i have saved up but am unable to meld to any gear. if im understanding this right i just need to get one of the main crafts to 19, do the quest and i can meld any gear? or do i need to specific craft for that type of gear to meld materia to it?

If its not the later which is one craft i can focus on that will give a good bonus to blm? im hearing Goldsmithing for weapons or weaving for gear? and input fellow BLM?