http://www.bdsmlibrary.com/forums/showthread.php?t=4529
Here's a good start by Aesop.
Each submissive wants to be dominated in a different way. Some like to be submissive 24/7, others only sometimes. Some are submissive by nature and some need to be made submissive, (with a whip for instance). Talk to her about what she wants, and be very open. Most of the responsibility is yours so be very careful or you'll fuck it up. It's aparent that she trusts you or she wouldn't want to be your slave. Some advice I'd like to have when I was 20 was, "think before doing".
There's not only one way to be a good Master or any special things you need to do. There are no things you must do.
She aparently wants/needs to be used by you. I hope you've come far enough in your life that you've figured out what you want, or things are going to get very confusing for both you and her.
There's plenty of ways to go wrong. Never forget that she takes pleasure in being your slave. If she doesn't enjoy herself you're doing it wrong, (Note: that doesn't mean she needs to smile all the time. People can enjoy themselves with tears in there eyes begging for mercy). Pleasure has many different faces. But being a Master isn't only an egotrip ride. It's most definitely just as much about her needs as yours.
Take care and don't count on this life being for you. Most people don't want to get all they desire. Only a few of us are bent that way.