I am building a simple eCommerce site using PHP. I have some guidelines listed below, but I am mostly struggling with the shopping cart/ordering form...

I am building a simple eCommerce site using PHP. I have some guidelines listed below, but I am mostly struggling with the shopping cart/ordering form concepts. Again, this is just a simple order form: Picture of the object and a checkbox to add to cart. Any guidance is appreciated.

1. The Login form should consist of fields for username, email address and password.

2. After login, a welcome message should appear providing a simple order form with at least 10 products of your choice. Be sure to include an image of the product and price.

3. Users can shop your store for up to 30 minutes before the session will expire.

4. Once all products are selected, the user should be able to checkout and pay for their purchases.

5. The payment page should display the username, email address and the products and total price of the purchases.

6. A "Purchase" button should be available to indicate the product was purchases and should generate a "Thank you" message of your choice.

7. On the Thank you message page, an option for logging out and essentially unsetting the stored sessions variables should be available and implemented.

8. Note all pages should have session timeout functionality.