There are some wonderful recommendations for "How To" websites already made in this thread.

Another thought though, would be to find a few erotic stories that not only depict the physical acts, but the mental excitement of both the sub and Dom and share those stories with him.

If this is the first time he has been introduced to the concept of BDSM in real life, he may have some preconcieved notions and stereotypes in place that lend themselves to violence, degradation and just plain nastiness. If you can share literature that depicts some of the beauty in the power exchange, he may feel more comfortable and confident in pursuing this with you.

Or not.

Best of luck,

Val