If you want to add an instant eCommerce experience to your website with Google checkout, use the Google Checkout tool in Free Tools.
Due to Google dropping support for Google Checkout as of Nov. 20, 2013, this tool is not available in the latest versions of Free Tools.
View the Google Checkout help documentation for more information.
Visit the Free Tools support page for more Free Tools tutorials and documentation.
If you're looking to expand into more robust eCommerce web development, you may be interested in eCart.
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These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.