Start creating a custom template

From Wiki

Everytime you need to create a custom template of any type, you have not to start from scratch.

The simplest way to get started is to copy the "Simple" template in your own style project. To use the new template you just have to rename it as you want and set it as the default template for the element.

To set the template as the default one you have to open the Layout.xml file, search in the editor for the element of your interest and choose from the available templates, the one you have just created. In this way, the web project automatically set the layout for the elements for which a default is set. Now you can start making your own changes to the template to customize it for your needs.