In this tutorial, we'll assume that we are on a trip from Nova Scotia, leaving from Sydney and arriving in Corner Brook, NL.
First thing is to create a waypoint. Here we'll click on the Placement Icon on the toolbar. This resembles a push pin. After adjusting the point to where you want, we can label the waypoint as "Sydney,NS".
Next we'll right-click the waypoint and select Directions from here. This will set the navigation using this waypoint as a starting point.
Our Second point, or destination can be another waypoint, or a search result. In this example, we'll type in "Corner Brook, NL" as our destination point. We could have easily used coordinates such as " 48.948122, -57.915058" If your location is correct, Google Earth will automatically generate a route with the turn by turn directions.
To save the route, we'll right-click the parent node of our navigation tree and select Save As… Here we'll name the file "Syndey to Corner Brook". The default extension should be .kmz