To fill you in a bit more - your presentation or "patter" should give a reason for someone to see what you do as more than "a trick", it is the narration to the plot. Many young magicians start off by giving instruction patter...like, I put the cards here, these are all read - but a more intelligent, artistic and creative approach to your magic is to give reason for them to watch. Your words add more than just the obvious direction, they allow you to add your personality, and give the effect life. This is a chance for you to think about the magic, and what it represents - in your effect, are you teaching them how to cheat...using the cards to show a mock example of sleight of hand?
You can really think outside the box, but make it meanful and real. It must be grounded in reality...so don't say the aces are acrobats...or that you have a fake hand - this is a far stretch. However, saying something that is true..."some people say I hide cards so well in my hand, you can't see them...no matter how close you look". I am not saying this is what to say, but it is a more intelligent and honest approach.
So - think about what the effect is, and how you want to connect that with who you are. There is much to learn about presentation - I STRONGLY recommend the book Strong Magic by Darwin Ortiz - and I DESIGNEDLY recommend Designing Miracles by Ortiz as well...I can never say that enough.
Anyhow, feel free to PM me if you have questions, as an entire thread could be done on the subject of presentations...oh wait,. it has...haha thanks Chopper!