First, forget just about everything you see on porn sites, a D/s relationship is still, first and foremost, a relationship and the usual rules still apply. Like any other relationship it's about love, trust, and sharing and it's essential that all party's needs be met. As a starting point I'd recommend two books, "The Topping Book" and "The Bottoming Book" by Dossie Easton and Catherine Liszt, they both assume no familiarity with the scene and are readily available through Amazon. Always remember that consent by the sub is the difference between scene play and abuse and that what you do is, or ought to be, an act of love on both your parts. Good luck to you both and welcome to our world.