Hi AMUAIT.
Definately not going to code an entire shopping cart for you.
I can however point you in a direction:
You will have to build your own page(s) to display your products / items with a link to add the item to a basket. Below is the fastest and simplest method i can think of right now to implement a cart system.
For the cart and checking out i would recommend visiting
PayPal. They have a complete tutorial on integrating a shopping cart into your site / application.
Please note, the above is a rough guideline and the proper implementation of the above requires various design considerations.