Figure out what kind of ants you have first, that will determine the best way of taking care of them. If you have “Sweet-Loving Ants” bait will be the easiest way to go, you can put it where you see the ants, yet still somewhere that your kids cant reach it, and like Judi said they’ll bring it back to the colony and whip the whole thing out for you.
I had ants in my room about a month ago, it took less than a week before they were all gone.