Your Gin and Tonic starts with long drink glass filled with ice cubes. Stir to cool the glass and get rid of the melted water. Add the Gin and the tonic. Finish your Gin and Tonic with a lime wedge. With some types of Gin some cucumber parts or balls or added. Enjoy!
You can of course adapt to ratio Gin and Tonic to your preferred taste. Just experiment and learn.