Several problems in portrait studio

Background paper is bought by the roll. The rice is dirty and broken, so it is not easy to get it. If you buy a background cloth, it's about 6 to 7 meters, depending on where you step on it. At least three lamps are needed, five lamps are recommended, and 300w lamps are enough. But it depends on what you are shooting. If Taobao, take two lights.