The nopCommerce documentation is here to help you through the process of setting up your store. These will help you get your site up and running quickly with the features you require.
Complete User Guide
nopCommerce User Guide is the definitive guide to installing, configuring, building, maintaining an e-commerce site using the nopCommerce. Covers the entire application from start to finish and is written in a simple to understand manner. Get it here (almost 300 pages).