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Here are some more hints for you:
1.Smoke grenades can extinguish fire.
2.If you are protecting something with your team, hold shift(optionally) and preaim at possible place where a enemy may appear.
3.If possible, ALWAYS buy defuse kit as CT.
4.Knife is "fastest" weapon in game i.e. if you hold knife, you will move faster than moving with (as example)negev.(But that doesnt mean that you should be running with knife always and being unprepared to shoot at enemy)
5.Utilize grenades to your advantage(And i always forget to use grenades)
6.(In my opinion, this may be actually bad idea)You should buy a kevlar rather than different pistol\grenades at pistol round.
Well, i may be wrong, so feel free to say that some of those hints are bad.
Edit:Also add me in OP, my steam id is wooter1337