Ruby seems to have covered things quite well. You are the top so it is up to you to decide what you want out of your submissive. With my slave I use both the "whips and chains" aspect as well as the mental one. I would set up a few ground rules for his behavior, keep them few and keep them simple.

Write them down. The idea of doing a BDSM questionaire is also a good way to find out what both of you like and do not like.

Most of all, remember that a BDSM relationship is not a static one. You both will need to communicate what you want out of it. And most of all be willing to adjust things as you find you need to.

I know that this is a spot for "questions for a mistriss" but many aspects of a BDSM relationship are shared by both a mistriss and a master.