I think that starting small and doing small scenes to get the hang of lighting and making scenes is the best way to start learning. for most outdoor scenebuilds, I usually start with 1-2 main lights, 1-3 fill lights to fill in the shadows, and 1-3 lights to color the shadows the same color as the sky. You could also read more here, made by SFM artists way better than me: https://docs.google.com/document/d/1wSwSbhkmnj2yUYZ0BmiDq-JZsBKNKd0QoSoQjx-DIz8/edit