It is always pleasant to hear of new Celestialists interested in the Guild! I can assure you that Mage Dure'dhel shall help inform you of more information about the Royal Celestial Guild of Gaden, and I would suggest seeking him out upon your arrival in town. If you are having trouble locating him, I am sure that Guildsman Asura, Initiate GRONK, or another local Guild members would also be more than happy to point you in the right direction.
I hope I find you well,
~ Darius Yanith
Sorcerer of the Royal Celestial Guild of Gaden