Hi there,
wordpress is not so good for e-commerce as far as I know however considering the few articles you intend to sell I would suggest you do the following:
Go to paypal or any other merchant and get the unique payment links for every single product you sell, then list your products on your wordpress website as separate posts and in the bottom of the posts include the Buy Now links which you already got from paypal. This way you don't need to install any additional plugins.
