Step 1: Get to level 15
Step 2: Talk to Sowel Lua in Alpen and get the first quest.
Step 3: Go complete that quest and come back for the second one and then the final quest.
Step 4: the last quest will take you to Knight Ella and thats how you finish the requirements for guild establishment.
Quest Monsters In Order To Be Killed:
Rebel Black Wolf (First Quest)
--261,336 North of East Entrance of Alpen
Wicked Parasol (Second Quest)
--243,415 South of East Entrance of Alpen
All you have to do after that is Click Knight Ella and press the Establish a Clan Button and spend 10k to make your guild :D