Honestly with crafting you're best to start out with weaver and carpenter because they have arguably the best cross class abilities and getting those 2 level 50 abilities will make it vastly easier to level up your other crafts. In terms of best craft overall, you basically need all your crafts at max level to guarantee the best results and the actual best craft to make profit varies quite significantly.

In short, there is no best craft and if you want to be successful in crafting you should level them all to max level in order to gain access to respective level 50 cross class abilities needed for HQing.