Basic Joomla Tutorial for new users, installing the Gantry 5 Framework and a Gantry Theme, Hydrogen is the default free to use template.

The procedure will be:
Download the Gantry and Hydrogen packages
From Joomla Administrator select Extensions - Extension Manager
Click the Chose File button and select the extension package on your PC
Click Upload and Install button

Requirements:
Apache 2.2+ or Microsoft IIS 7
PHP 5.4+
MySQL 5.1+
Joomla 3.4+

Download Joomla Templates Built Upon Gantry 5 Framework: https://gumroad.com/adi8i
Get in Touch: https://gitter.im/adi8i/adriandev