Photography order page & client database (no online payment)

I have a real estate photography website that clients will order photo shoots through. I need an ordering system setup (no online payment, client will be invoiced separately) and a client database built. Order System: ---------------------- The order process will be several steps, each step on a new page but a shopping cart side-box will keep a running tally purchase price throughout each page. I would like the ability for the client to enter a given discount code. Once the order is complete, the client will be emailed a confirmation with invoice number and order details. EXAMPLE: [login to view URL] Steps will include: Enter basic property information (property type, number of beds/baths, price, sq ft) next page Choose photography package (3 fixed priced packages plus option to add extra photos at $ per photo, enter discount code) next page Choose extra photography editing options with js lightbox for “more information” (each extra option is priced separately) next page Enter detailed home information (address) next page Schedule day and time photo shoot, any important information about property next page Register as new client or login as existing client to review and complete order At this point the client will receive an email with invoice number and order details. I will also receive email with all entered information from the order. Client Database: ---------------------- Clients need to be able to register and login. The database will hold client information, allow client to login, select and download photo package as .zip.