Matimi0's Mind Games series should be very helpful once you start getting into the game a bit more =)Also, it is extremely important that you disable mouse acceleration - trying to aim with it on is like trying to aim with a steering wheel. Seriously, I instantly got better at CS:GO when I disabled it.
One last thing: learn the recoil patterns of your favourite guns, and get used to controlling their vertical recoil, either in the testing range or an empty server.