Website Creator and content manager

I need to create a website where my customers can purchase a website that will be created automatically out of 5 to 10 different templates. They need to be able to manage the site without having any knowledge of html. They need to be able to buy different modules such us calendar of events, banner & content rotation, e-commerce, news flash, business directory, newsletter subscriptions by cat., search engines, opinion polls, etc. The whole site needs to be CSS driven, meaning that the client can change the styles of fonts, perhaps lines at any time. There needs to be a way to create new pages and at the same time add these pages to the dynamically created menu navigation. The websites are going to have a large amount of pages. There need to be a file management system as well as a image manager and page manager. On our company’s website, the clients need to be able to purchase extra modules at any time and get them install automatically whiting their website. Our company will provide web hosting for all sites. There needs to be a way of automatically update website on the newest modules. We would like to work with local companies. We are in boca raton Florida.