Android Wear work exactly the same regardless of which watch you're using. First and foremost, you can choose to have the watch's display stay on all of the time or to leave it off until you activate it. If you leave it on, the watch will enter a dimmed mode whenever you aren't interacting with it; you can then tap its display or simply raise your wrist up to get the display to fully illuminate. (An accelerometer in the watch makes that wrist-raising motion possible.)
Some of the suggestions Android Wear provides:

• Take a note

• Remind me...

• Show me my steps

• Show me my heart rate (only on Wear devices with heart rate monitors)

• Send a text...

• Email...

• Agenda for today

• Navigate to...

• Set a timer

• Set Moon

• Start stopwatch

• Set an alarm

• Show alarms

• Settings