How to be a dominatrix?

I have found a guy and we have agreed that we are going to do it we have also discussed the idea of me dominating him in a ual way and i am interested in doing so! I am going to purchase a y outfit and heels and wear them but what I really want to know is when it comes to the bedroom what should i do and say ... i want to deny him and and make him my toy but i am not confident and this will be my first time and I really do not know what to say.. (the rude things) I want to be bossy and DOMINATING!