Click the in right side corner menu bar -- > pages --> create custom pages --> here you can write about your business or your product, and share this links to all..
http://mashable.com/2010/02/22/build-facebook-landing-page/ - here you can find detailed manual about how to "Customize Face book Business Page". Or you can do a google search with "facebook custom page" key phrase.
the simplest method for your is buy a certified FBML template and then use instructions on how to install it. However you can also design a landing page with 520px width and simple install FBML application to you business page and insert there <image src="your_image_url.jpg"> thats all.