To join the fighters guild you must go the the guild hall in either Anvil, Cheydinhal, or Chorrol. Then you must talk to the guild hall's leader. You must not have a bounty on your head or have an infamy level of 100 or greater.

Perks

First off, when you take something from one of the guild halls it is not considered stealing. Beware, however because most of the items in the display cases are only replicas, therefore useless. When you join the guild you can get training from the guild members. When you are the master of the guild you will be paid money every month, without having to do anything. Also when you join the guild you can get special items and quests that you couldn't get otherwise.

Ranks

Rank	Name
	Associate
	Apprentice
	Journeyman
	Swordsman
	Protector
	Defender
	Warden
	Garden
	Champion
	Master

Quests

For quests please visit oblivion fighters guild