You can check the version of your plugin and Gauge core by executing the following command.
$ gauge -v
If this enlists a version then you're intallation and initialisation is has been successful. Your output will look like this:
Gauge version: <version number> Plugins ------- language(<version number>)
You can read more about plugins here.
If you have Gauge and your language runner installed, then see how you can create a Gauge project.