If you're in a rush there is no "Quick" method. I raised all classes simultaneously to 50 along with my gathering classes. This kept my material costs low. Save leves for crafting and do the slow grind on collecting materials. Daily supply and provisions help out tremendously. Provisions HQ with a star can sometimes net you a level just with the one turn in. It was slow to get them all up there and is just as slow to get them all melded but it is worth it imo. I can take something I find craft it and turn it around for real money.