How to get Whiterun Guard Armor

Honestly I think Whiterun has some sort of death glitch since I once walked into my house there and walked back out about 5 in game min to suddenly be facing 3 dead guards and the body of a dead dragon. Since it wouldnt be possible for tem to kill a dragon in 5 in game min im assuming it was a death glitch which is affecting you in a different way.

There are three trainers for light armor (source):

• Scouts-Many-Marshes | Located: Windhelm | Adept (0 - 50)
• Grelka | Location: Riften | Expert (0 - 75)
• Nazir | Location: Dark Brotherhood Sanctuary* | Master (0 - 90)

**Nazir eventually moves to the Dawnstar Sanctuary if you are doing the Dark Brotherhood quest*

@Layke outlines an effective way to use a trainer to level up without needing to worry about money, and also level up your pickpocketing skill at the same time. You just train, then pick pocket back your money, rinse and repeat.

A method to level light armor without making use of a skill trainer is to find a weak enemy (like a mud crab), and just let them attack you for awhile. If you use a healing spell to keep your health up, you shouldn't run into any problems. Using this method you'll be able to level up your Restoration skill as well.