Once you create an automator script, you can run them by going to the application menu and choosing services (for example, Chrome > Services > j2m). Or you can one-up your game and attach the service to a keyboard shortcut.
To do that, go to System Preferences > Keyboard > Shorcuts.
Then, in the shortcuts, go to Servies and then scroll down to Text.
You should be see the service you have created in that list and can add a keyboard shortcut to it.