Here's what I'd do. I would beat them or hurt them. At first...
I'd psychology break them down. Get to know them talk to them and have them begin to associate me with something "good" and "nice". Not threatening. Preferably I'll take in ones that have been abused hurt or harmed. Or better those who had no home. They'll be more willing to listen and obey. Then I'll slowly drug them, keeping them away from any other men as their minds go to me as a positive male figure. As those needs come around they'll think of me and how well I treated them.
Next I'll begin offering them the chance to bear my children and they'll eagerly accept. Over the months I'll be more cruel as the baby grows. I'll sabotage any work they do and discipline them accordingly. Either spanking, sexual humiliation in front of the rest to reinforce that they belong to me and possibly the worst I'll do: with each girl, while I'm pounding them andy cock inside, I'll threaten them that if they ever fail to do what I ask that they could have an "accident" and lose the baby they love so much and took such great care of. I'd never do that to them of course but the threat is enough. They'll be confided and scared but reassure them they have nothing to fear as long as they are a good slave.
Now if they were to break a plate and see me, I'll order them to follow me and I'll pound her while the fear messes with her mind but the love she holds or had makes her try to accept that I wouldn't do that to her.
Every 5 year they'll have a child and are forced to watch me breed new girls as they take care of the baby (and me being a good father, taking care of them). Don't know if I'll make the daughters sex slaves. Sons I'll teach them how to do the same.
Rinse and repeat. Not the best model but I love the though.