What do you know about Whiterun?

"Well, I know the Companions make their home here. Their mead hall, Jorrvaskr, is the oldest building in the city. Oh, and there's a nasty feud between two families called the Gray-Manes and Battle-Borns. You'll want to be careful there. The rest you can find out by asking the townsfolk. I'd start with the barkeep at the Bannered Mare, or the castle steward."

Bjorlam

Bjorlam is a Nord carriage driver who may be found right outside the Whiterun Stables. He waits there until someone needs a ride to any of the hold capitals.