There has been a little confusion as to how a person gets guild quests. Guild quests must be bought from a NPC in Regenshein. This is detailed description on how to buy a guild quest.
1. The Guild Administator, John Hubert, is located East of the Citizen Registrar in the Administrative District.
This is what he looks like
2. Talk to him and choose the "Shop" option from his conversation menu.
3. A series of guild missions will appear in the shop window.
Then you just buy the mission that corresponds to your level range.
-Mission 1 - Level 1-10
-Mission 2 - Level 11-20
-Mission 3 - Level 21-30
-Mission 4 - Level 31-40
-Mission 5 - Level 41-50
-Mission 6 - Level 51- 60
-Mission 7 - Level 61+
Hope this Helps
As we all know these will need to be done to help guild level