Aiming Practice

You can go through the campaign on various difficulties until you think you have the controls down, MW 2 was the first FPS game I played outside of my comp, got it on Christmas too and only until about 3 days ago I've decided to take part in the Online play, and it depends on the gun too, some have higher ranges than others.
You won't be too good at first, I'm still not that good, but I still get in a few kills. xD