Something to always remember, to have the correct buttons display you have to have the object selected. And always be ready to hit the TAB key. This is the key that takes you in and out of edit mode and object mode.
If you turn your Lamp into Area or Spot, other buttons will appear.
Shadows options are also available in Shader buttons with objects selected (because they are object sensitive not lamp sensitive), and can be set on and off in the render buttons.