Select Multiple Items Tables, Add to Cart, View Cart Later, Email Cart Contents

I've developed a webpage that displays the contents of my database. The user has 4 different views to look at, (View 1, View 2, View 3 and View All). In each of these views the user can select some rows, add the rows to a cart and continue browsing.

I know how to get what the user selected , but i don't know how to get what they selected, store their selection, allow them to continue surfing, store more rows, and then finally email the administrator their selections.

This is what i don't know how to do:

1. I do not know how to allow users to Sort Columns by clicking a Column Header.

2. I do not know how to allow user to select rows (via checkbox) and send the selections to a cart (structure i am assuming), continue browsing and add more items to cart.

3. I do not know how to have all the pages display how many items they have the the cart.

4. I do not know how to have user view cart and delete selections.

5. I do not know how to have user email their selections over to an email address that is stored in the same database (different table).

6. I do not know how to send html email to administrator.

To get a more concise picture of what i am attempting, please view the following

1. My previous post: https://www.experts-exchange.com/questions/20807809/Emailing-Contents-of-An-Already-Processed-Form.html#9816347