I'd pick up my slave, take him to my place, show him to his quarters, give him clothes and let him keep any personal effects he has, tell him he'll be paid with food and somewhere to live, rewarded for exceptional work and will never be over-worked, be treated when sick, have access and contact with the outside world, and be educated if he wishes.
Then I'd take him to the foyer, pop off his collar and say "There's the door, you remember how to get to your room. It's your call." and go back to my other business.
Fuck slavery - I'd rather an employee and companion.