placing own celebrities

If you have a wide variety of homeless sims it will use them. You will need to make sure you have a good selection of different age groups from teen to elders. Don't worry it's not a huge number. One way to know if the game is short is what I do is this. I will take all my sims whether I play them or not, I will mark them by clicking that little heart down on the lower right side of the box that shows the different family groups, leaving the other side completely empty. Then every so often I will check that other side to see if the game created any new sims. I will then either delete them or edit them, but this also lets me know if I need to add some more of my own sims, and which age group. Also for the choices on the number of sims allowed in the game, I always check the unlimited choice, this way if something happens the game won't be deleting any sims and will give me full control in this area as well.