If you really want to be a master in bed, you need two major things: experience and sensitivity (listening skills).
1. The part about sensitivity is the most important because it means you will listen to what the girl likes and then do it. Not every girl or woman is into everything out there. It is up to you to ask and then do it for her. For example, some women really like to receive oral, and others either don't care or don't like it. You have to make sure what she is into.
2. Experience basically means you know what options are out there and you use them.
Look into the following things and try to get better at them (if the girl you are with is actually into them): oral sex, anal sex, using your hands for such things as finding the g spot, sex toys (these can be amazingly fun for women), and kissing. You can find information on all of these things by simply checking google, but more importantly practice makes perfect!