So, ready to unlock GEO?
Go talk to Sylvie in West Adoulin. She'll ask you to bring Petrified Wood and a handful of homeland dirt.
The dirt can be found in your HOMETOWN's Teleport Crystal, under the steps.
Windurst > Teleport-Mea
etc
Go back to Sylvie, she'll tell you to find an Ergon Locus and /rest at it. It is located at K-10, on an island at the south eastern most beach in Ceizak Battlegrounds. /heal there for 5 minutes, or until you see the message "You feel a mystical warmth welling up inside of you."
Go back to Sylvie.
You'll get your first bell and your first spell, Indi-Poison.
Vendors right across from Sylvie sell Indri and -ra type spells.
Geo-____ spells are found by visiting Geomantic Reservoirs scattered about the middle lands.
Refer to this topic for them: http://www.ffxiah.com/forum/topic/37140/gathering-geo-_____-spells/#2274623