Level the gatherers first for sure as they will then be able to obtains some of the items you need for the crafters (unless you want to spend a fortune from the MB). Use Levequests for the gatherers, collections, deliveries etc and soon you will get to 80. I started character June 18th and went from 1 to 80 through the MSQ and have now got Miner to 80, Botanist to 73 and Fisherman to 65.

Only get gear you can share between the DoL roles and be prepared for Fisherman to sap away hours and hours or maybe even days of your life.