I agree with Swimfins, go to a walmart to get your starter supplies. But, Beware, kinda go in with an idea of what you want, since you will get no help choosing whats good for your tank (unless you are lucky). My hometown has 2 WM's and the one's fish dept is woefully understaffed and darn near incompetant. The other is well run and you can usually get some help. be careful buying fish there, too. the same as above aplies to fish, you need to watch out for what you are getting into. inspect the tanks thoughly and ask the clerk lots of ?'s. Don't buy if you are not satisfied they are knowledgable. if they dont know fish, they probably aren't taking good care of them and they'll probably die soon after you get them home.
Bryan