Adding to what Lady Arana said, SM101 by Jay Wiseman is a book I found very informative and helpful, and it includes, as I recall, pre- and post- scene checklists/questionaires, which can open up a lot of conversations. As said over and over on this site, communication is key. My lover is a switch-top, bottom, and vanilla. So far, I have found us to be fabulous vanilla, and that he is very good at topping me, but I stink at topping him-because his ideas/fantasies/needs as a bottom are so different from mine that I pulled him out of sub-space by doing something I would have wanted, but that didn't work for him.
So, while asking other Dom/mes for advice is never bad, ask HER what her fantasies are, what her hard and soft limits are, what she is afraid of, what she is afraid of but wants to try anyway, and what she thinks submission (and domination) is about. Try to have these conversations outside of the bedroom, dressed, as equals--two people who want to enjoy an alternative sexuality for their mutual pleasure. That will give you a lot of ideas about how to "break her" gently yet firmly, or tell you that the two of you have such different ideas about it that you will not be compatible (which I hope is not the case for you; I am a fan of romance in all varieties, and always want to hear that people have/can find a match, but is something you should be aware of as a possibility.)
I'm not a Domme, although I am trying to learn to be one for my switch lover, but I hope my comments help both of you. Good luck, and remember, safe, sane, and consensual is the way to go.