J3.x:Creating a simple module
From Joomla! Documentation
This is a multiple article series on how to create a module for Joomla! Version . You can navigate the articles in this series by using the navigation drop down menu.
Begin with the Introduction, and navigate the articles in this series by using the navigation button at the bottom or the box to the right (Articles in this series). There are 2 videos accompanying this tutorial which you can view at Basic Joomla Module Development video 1 and Basic Joomla Module Development video 2.