Customise and finalise OsCommerce Installation

I've installed OsCommerce from Fantastico on the cPanel and it is up and running perfectly on my domain. I need someone to change the default appearance so it is centralised (800px) and has a nice clean look and color scheme. I would also like the checkout integrated with UK paypal so I can easily input the details of my paypal account for payments. I will change the header and footer graphic to incorporate the company logo and input all the products, categories, images and prices myself once you are done. All I need you to do is customise my existing installation and help me through finalising the store to make sure it runs perfectly. Please bid only if you have good knowledge of OsCommerce customisation and module installation/tweaking. Thanks!