Using Plug-In With Current Theme

Hello,
I want to use my current theme with your plug in. http://www.khbf.org

We have very few products.

2 event entry fees
a hat
2 sweatshirts with size variations.

I have created all the products in WP. Now I just need to display them in a list with an add to cart button.

What is the best way to go about this?

Julie