Hi,
It depends on what time (day or night) scene you want to create.
1. For daylight scene use windowlight (you have a big window on the left) and also you may add some general lights to illuminate the scene.
2. For night scene, put light objects where you will normally put in real life and adjust color and intensities to simulate real lighting in the night.
Ofcourse these are general procedures but read on user manuals on the use of lights and dialogues and practice.
In your scene the light you have put just increase the cone angle and your light will fill the room. But again it may not be realistic lighting.
Anyway just do the reading and if you have more problems just ask, we are all here to assist and be assisted.
