Jazzman I am currently a switch who is trying to figure out if she is Sub of Dom.
My pet is much more experienced than I am. I spent 5 days on the web trying to find out what submissive men want. Like you I was worried I would not be able to fulfill his needs. I will give you the only advice on the web that I found useful. Enjoy yourself. Whatever you come up with make sure it brings you pleasure. She is there to serve your needs. If she feels like she is meeting your needs she will be happy.
I must admit my pervy mind has been a little hard on him lately but I truly am enjoying myself. He is such a horny beast and would please any mistress.
I am sure there are other more experienced Doms who will be able to help you too.