which camera do you have ijoel?
for compact cams, only fuji f-series have good high ISO capability.
i regularly shoot at ISO800 with my F30. happy with the outcome so far. sometimes even ISO1600 if anything else fails

u need to learn more about exposure, which is a combination of ISO, aperture & shutter speed. just google them & u should get at least some basic understanding for free. i think your manual should also mention something about it