Welcome to Polymer Starter Kit Light!
To begin, fire up a local server from inside the app directory. Please make sure to serve up the contents of the directory rather than root as routing will otherwise fail to correctly function.
If you are a Windows user, install Python and from inside the app directory run:
python -m http.server 8080
or on a Mac/*nix machine, run:
python -m SimpleHTTPServer 8080
You can of course also use WAMP or an alternative tool for serving up content.