This was something i was shown today, its helped my game a fair bit, and improved my aim recognisably!! =)

"sorting your mouse out, get it so you can control your spray, enter these commands

-noforcemparms -noforcemspeed -noforcemaccel -freq 100

in your launch options

steam > right-click CS icon > properties > set launch options > paste into there

this should make the game more crisp, and allow 100hz rate in CS

now sort your recoil out, to something you can control, but quickly..

Then join an empty server, buy your AK/M4 and spray at the wall without moving your mouse, notice the spray direction, and it should be similar each time (for me M4 goes up and left, AK goes up and right) so counter this recoil, by pulling on your mouse in the opposite direction slowly, to keep your spray nice and tight"

Please feel free to add more tips, and info to do with configs and handling of rifles!!!! The more the merrier, as im still learning -__-

hope i helped ^^