Sneaking/Thief Troubles..., Thief Tips, anybody? ^^;; Options

[MerGirl]

Um, some dumb-ish questions on tips on how to be a part-time thief-part-time-battle-mage.

Okay, here is my situation: I have done a few of the main quest-quests, and I'm thinking of taking a break and joining the Thieves Guild. Bribed and used my lovely Speechcraft skills on a beggar. She mentioned something about meeting at the Elven Gardens or something (forgot right now) with the Thieves Guild.

I've heard on official elder scrolls forums that there is some sort of 'test' you have to pass in order to become recognized as a Thieve Guild member.

*Okay, what I'm worried about is, what level should I be to pass this test? Like, how high of a sneaking skill/thieving skill should I have?*

I've tried stealing a few things, but, as soon as I get out of the house/building, the nearest guard would rush towards me and punish me as if he had psychic powers or something. *Could someone explain how the crime system works?* Apparently, my sneaking skills are too low or something.

Basically, any sneaking, stealing, pickpocketing, thief tips are greatly appreciated. Thank you.