Are you going to keep the carpet, curtains, cushions or existing furniture? If they are neutral colors, they probably will not affect the colors you paint the room.
If you are going to keep furniture or accessories that are of a bold or bright tone, you can perhaps use this color as a starting point to choose your color palette.
How Will Space Be Used?
Defining the function of the room will help you determine the type of environment you want to create.
Are you going to decorate a bedroom that will only be used for resting or will it be used for work or study? Will the kitchen only be used for cooking or will you also receive guests in the same space?
By asking these questions at the beginning of the decorating process, you will be able to define the type of space and the type of environment you want to create.
At What Time Of Day Is The Room Used Most?
Will the room be used a lot in the morning, afternoon, evening or all day?
The amount of natural light that the room receives will affect the way colors are seen in space. If a wall gets direct sunlight during the day, you can use a stronger tone than the color you chose to prevent it from being worn out by the bright light.
In What Direction Is The Room Oriented?
If the room faces south, you probably get a limited amount of natural light. To balance the weak view of the room, the best option is to choose warm and pale tones for the walls, such as light blue, primrose yellow or baby pink.
On the other hand, the rooms facing north, generally receive a lot of natural light; some may even need colder shades to help balance the glow.