As this is an open forum and it is unethical to give away secrets on here, I would advise you to get hold of a good card magic book that teaches basic principles in magic. eg The Royal Road to Card Magic.
I am sure if you learn everything in the book and take in all the principles, you will already know the principle of this trick and how it is done and a lot more besides. You will also be on your way to being a good card magician and hopfully want to further your knowledge in other areas of magic!
