Build an Online Store

I'm trying to sell a customised service with a webpage. Here are the pages I need: 1. A single page describing my product and service. Has a newsletter field for customers to subscribe to newsletter. Has buttons where customers can download some .psd files (after they like our facebook page or given us their email) 2. A service builder page (that can be linked to from the first page). Customers can select the options they want (prices will change) and even attach their own files. Since I'm providing a service, customers can select a date for my service. I can have blackout dates or peak dates (higher prices). No need to worry about inventory. After customers finish building their personal configuration of the service, they can immediately checkout and pay. Their configuration will be sent to my work email. If they do not wish to pay at the moment, they can choose to send themselves the configuration as a quotation email. The email quotation must contain a link where they can come back to the same shopping cart with the configured package.