Vikas, we cannot tell you if 800 is the proper ISO setting for the amount light in your room because we do not know how much light is in your room.
You would need to set you camera's ISO to 800 and use the meter in the camera to tell you what settings are required to get a proper exposure. The issue will be if the amount of light is so low that the shutter speed needed to get the proper exposure is so slow that you will get a blurry photo from camera movement while taking the photo. IF the shutter speed is slow or long you will not get a sharp clear photo unless you use a tripod or increase the ISO until the the shutter speed required is fast enough.
The ISO setting on a camera is simply a way to increase or decrease how sensitive the cameras sensor is to light. Increasing or decreasing the shutter speed or aperture (fstop) is the way you adjust the AMOUNT of light you are allowing to enter the camera and fall on the sensor.
Using a tripod would be your best bet because you can then use a LOW ISO. A low iso will give you a better photo ( IE: less digital noise ) than a higher iso.
( newer cameras perform better with less digital noise at higher ISO's ) The amount of acceptable digital noise for you is dependent on what you intend to do with the photos and your own personal preference. If you cannot buy or borrow a tripod than try adding as much light as you can into your room. Using the same kind of light will be much better than using two different kinds, Meaning that different kinds of light bulbs emit light rays of different colors (kelvin temperature ).