Take Up Arms
How to Obtain: Join the Companions
The building up on the hill in the city of Whiterun is called Jorrvaskr. You can find it to the east of the steps up to Dragonsreach. Head in and head down to Kodlak who is downstairs in the basement, in the far room at the far end of the long corridor. Speak to him, begin your training, complete a number of mundane fetch and deliver tasks to finish the “Take Up Arms” quest and join The Companions.