Free Magento User Guide
The Magento User Guide is here to help you through the process of setting up your store. The User Guide begins with an introduction to installing and configuring the basic settings for your store, and then walks through the steps to configure more advanced settings, setting up your payment modules, creating and editing categories and products and much more. If you have a specific question on an element within Magento you can skip to the chapter within the User Guide using the table of contents to the right. If you are just getting started it is best to go through the User Guide chapter by chapter to walk you through the process of configuring your store. if you would like professional installation service, contact us through This e-mail address is being protected from spambots. You need JavaScript enabled to view it  
Read the comprehensive magento user guide from here.