There are two different archetypes for MyFaces (and another archetype for Trinidad/ADF subproject, the set of components donated by Oracle). The two MyFaces archetypes are:
MyFaces Archetype: this archetype creates the basic structure for a project that will use MyFaces. It includes all the dependencies needed so you don't have to find them out. The best way to start a new web application.
JSF Components Archetype: aimed to those that want to setup a JSF component library project. This archetype will create a maven multi-module project, that contains the artifact for the JSF components and a webapp for the examples. Everything setup and prepared to be deployed out-of-the-box! Includes a very simple demo component, that can be used in any JSF implementation.
Start coding now using JSF. These archetypes make life easier. There is no excuse!