This goes along with the idea that the newbie's motives never drop in the tutorial. Turn on "free will" and get Bob and Betty a job. Build up their skills, then put a weight or something on the "3" button on your keyboard. Let the game sit overnight, and when you come back in the morning your Sims will have made plenty of money. The tutorial is the only place in the game where you can let the game sit overnight, and come back to Sims that are still employed. Then if any of the other families in the neighborhood need an extra boost of funds, just kill off Bob or Betty and have your Sim marry the other one. You can then kill off the remaining Newbie and keep all the money.
For more Tips & Tricks for playing The Sims, including Time Management, building Skills, and getting more money, click here.