Here are some typical descriptions for different rooms in a home. After defining the desired atmosphere for the room, you need to associate the description with colors. This should get you started. Color is very personal, and your perception is based on your past experiences. Here is an example.
White walls makes it easier to see how clean it is.
Can mean the sunset over an ocean. You are sitting on the beach with the lavender sky and the blue ocean at rest. Or it can mean a sunset over the pasture. You see the greens in the grass and the pale blue and lavender sky. After choosing some colors that meet your described atmosphere, ask yourself if you like the colors that you have chosen.