ashyypem You can also use the freerealestate cheat to get the sim on to the lot. Just select the household in Manage Households, click the move button and go to the map screen. Then type the cheat at the map screen (you'll see the lot outline turn green) then place them on the lot. Your sim will still have whatever money they had before move in so you'll probably need to watch money for a while as you play if the house is a big expensive one. Or just cheat the household the money with either the kaching or motherlode cheat.
Hope this helps.