First of all, you won't get any CC or mod links on this forum. The Forum Rules clearly say that the forum discourages any use of that type of content, because it can harm your game.
Here's a link to the rules.
On the question: I would not recommend pursuing that lifetime wish for any of your sims. It is VERY hard. You have to possess 50,000$ worth items which is a challenge indeed. In Sunset Valley, at least. I chose this wish for my Dynasty founder (silly me), and the worst thing is that you can't sell the items you steal, otherwise your meter will go down. Like you steal Agnes Crumplebottom's car, sell it, and your meter till 50,000$ is still at 0$.
Kleptomaniac trait is a must for Sims to have this LTW. Only thieves (Criminal career, Thief branch), their descendants, and private investigators (after a certain career level) can sneak as far as I know. And only PIs can pick locks, I think.
Nothing really special but being able to steal 3 items each night.
Good luck with your story, hope this helped.