Our eCommerce tutorial for creating a product catalog has a section on creating the product Admin and the product display pages:
http://www.webassist.com/tutorials/Create-a-product-catalog-eCommerce-Series
The same concepts will apply to your admin pages and display pages.
Though it sounds like what you are realy trying to do is create a CMS System. You may want to look into the Power CMS Builder available in Design Extender:
http://www.webassist.com/tutorials/Getting-Started-with-PowerCMS-Builder