If you just bought a new house and will start decorating, keep the walls simple and majority of the walls plain especially if you are the typical Filipino who keeps accumulating things over the years and can't throw away anything because of sentimental reasons. So that when you move in your furniture, wall decors and accessories, the rooms will not look cluttered.
If you are buying new furniture, measure your room and the furniture. Scale the room & furniture on cutout newspaper: 1 feet = 1 inch and see if the furniture are proportionate to the room. Make sure there are ample spaces to walk around your furniture.
Feel free to mix and match different styles of stuff, like contemporary furniture with oriental pieces. Just don't over do it. Make sure they blend together.
One way to beautify a room even if the walls are plain white is by putting moldings or cornice on the ceiling edge and baseboards.