Ok, figured i'll start this one since we'll need it sooner or later.
Seekers of Adoulin missions are pretty straight forward at the start.
The first part is analogous with getting Adoulin access.
1) Darcia, Lower Jeuno.
2) Get your geomagnetron, check a geomagnetic fount, return.
3) Use the waypoint in Lower Jeuno
then cutscene, cutscene...
4) Head to Western Adoulin
5) Check out the Pioneers Coalition
am I missing anything? there's more isnt there?