Start with Atui Balacs in Sand Grain, accept the quest "rest area on the barren sand", run to Marzana in Ibellab Oasis to turn it in, pick up the quest called "token of lavania league" and from there you'll be able to talk to Marzana again to get the knowledge on token of lavania league, if you follow the quest from Marzana to Shuriar she will give you a quest to meet Ashim, talking to him will give you the knowledge on token of desert trading