Sorry for not answering right away. I have recently started asking people to explain what they know before I walk them through it. Since you showed that you have done some work on your own, we'd be more than happy to help.
What insom posted is assuming you are breaking into a WEP-encrypted network. This is pretty trivial in most cases. Depending on the network load, it can take anywhere from a few minutes to several hours to break.
Assume that everything I say is or could be a lie.