When Macintosh came out with the point and click, they had three buttons. Testers were nervous to use is because they thought they might press the wrong button. Mac simplified things down to one button. Hold mouse down for right click.

To sleep, log out, or shut down, click Apple icon on top bar, menu will open down. Click on Sleep if you just want to walk away from the machine for a few hours.

Keep a lamp behind the monitors to shine against the wall for nighttime usage... that goes for the television as well.