-Darklight + relic from farming wp/ak.
-Use myth tomes on relic + 1
-Run coil every week for Allagan gear and use myth tomes to complete your best in slot gear found in one of the many class threads in the forums
- Repeat for all classes

Game is pretty linear, so there's pretty much no other way to gear up...unless you have millions of gil and get a crafted overmelded set