What possible actions can I setup with the Gear?
After selecting -Notification- you will have to input the title and the I. Note that the action "DO Notification" can receive text input from a trigger such as New Photo (file location path), SMS, Gmail, etc.
As soon as the trigger is satisfied, a notification will be displayed on the watch automatically. Such notification will show only the TITLE, to read the MESSAGE you have to use the Notification App provided by Samsung.