In that case then I’d start with one. Have them go to my job. And see how well they do at the job. Then get another one and have them do another job at a different site. Once I’m pulling in $200,000/year. I’d start traveling and see the world.
Since they are free. Then they don’t need food or water. Just need the heat for the house. Also need the electricity. As for clothing. Other then work clothes they can wear tshirts and jeans.