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You will find several examples of Forge plugins in the Forge git repository (https://github.com/forge). All the repositories that start with 'plugin-' are examples.
You have probably found these already but you can find general information about developing plugins here: http://forge.jboss.org/docs/plugin_development/. More in particular you will find info about facets and how they are to be used in your plugin here: http://forge.jboss.org/docs/plugin_development/facets.html#content.
Oh and by the way, if you still have particular problems after reading these and getting started as described, feel free to continue asking ;-)