Big Cartel Shopping Cart CSS Help

Need help with a Big Cartel type shopping cart. Tried ripping the CSS off another cart that I liked ([login to view URL]) and implemented in on mine. I do not fully know CSS so this is what I will need: To view the current cart, check out [login to view URL] -top header to have background image of a gradient (much like the get a freelancer website) -top header logo to lay over this background -products to be centered -products to reflect oversized images @ 350 px by 350 px (like the black axe site) -bottom links to be laid out horizontally rather than vertically A possibility that there could be more changes after this work is done. Obviously, I will be willing to pay more if there is. Job must be done by 10/15/09 at 12pm pacific time.