need to set up a network in Ubuntu but I don't know enough to even find a good how-to.. help!?

What I want to do just has to be easy but I can't seem to find an easy way to do it. I just want to network my desktop to my laptops for easy file sharing. What would be the best method to do it? I'm reasonably computer literate but completely networking dumb. Everything in the house has wireless and I'd prefer to use that.