Had better upgrade to version 1.4.27, whichever race will do, career sites that suitable for sneak is on snow-capped mountains on the back of the Raven Wood, crossraods of the positive top of pits will be a good place where will happen random events to pick up the money and equipment every day, there are many powerful monsters.
In early days, risk index is relatively high, if you are non-stealth career, attack these monsters, the first time, there will be great chance of encountering almost four bandits, two bandit leader and two villains, these punks have high alert capability, make punks discovery, then hit them with remote, anf then immediately with sneak, hide behind a rock, go until the strange eyes narrowed in a line but can't see you.
Now start practicing stealth, these punks have high vigilance ability, even eyes narrowed in a line, still able to detect your breath, Display bar on the head still show four red points, so you have to squat to maintain the with monsters, stealth skills would have been upgraded, until these punks disappeared, the game time is eight hours or so, then you can read newspaper to spend time, will upgrade to level 15 less than half an hour, can upgrade sneak skill to level 60, you should repeat this kind of this thing in the next day if you want to upgrade to level 100.
This way depends on your choosing thief career, it is also important to choose a good career with ESO CD Key in the game.