Entire example of Paypal Shopping Cart on a website

Can someone point me to an example of all the code that I need to create a shopping cart using PayPal. I simply wish to insert an "Add to Cart" button under each item for sale...have a "Check Out" button and all the payment options. I need to have this on my new site and can't afford to pay someone to do it. I have enough software development experience but just not sure of all the PayPal pieces I need.

The site is very easy. I'm selling photos online. Each photo just needs an "Add to Cart" button. I'm loading the images from the File System using a loop, so each button needs to be unique with the information for each photo.

Thanks,

Hii Blakemckenna,

Please refer this video might it should be helpfull to you.
https://www.youtube.com/watch?v=iVzQEf0IEYE

I've figured out how to add a button. With that said, I have a lot of items on my page. Do I need to create a button in paypal for each one or can I do it dynamically through my HTML & Javascript?

Also, do I really need a PayPal Business Account? Does that cost anything?