One more quest 'till I'm Thieves Guildmaster.

How do i get into the Castle without getting chased? On the last couple of Thieves quests, I just ran for it with guards cahsing me...
Also, What Armour's beter than Leather? And Bow better than Silver... At level 5?

Seriously. I only use Bow, But sometimes it's too weak, I have Steel arrows too.