when i first started playing several years ago, i was told by a natural pro that i should load up my own servers with 5 bots on the hardest setting and all of them on the opposite team... when they are on the hardest setting, they step 2cm out of cover, see you half way accross the map and shoot. This will teach you how to use the enviroment and stay out of hot zones.
as for the HEC (hand eye coord) evenetually u will get amazingly good skills with hec using the bots. cos they will pop out with such little visual on your behalf and you will adapt to this and manage to naturaly spot one from a mile away when they peak out a corner and your aim should improve to you swinging your arm around and getting your wrist to adjust the aim at the same time, then crouching, bang bang, head shot...
when you win your first round against the 5, u will feel brilliant, do a few more, and after you get 3 wins in a row, go to a online server, play for a while, then back to your own server and bump it up to 7/8 bots... see where im going with this? eventually after a week or 2 repeating this, u will have amazing HEC with your mouse and a brilliant technique when being fired at, you will no longer be killed 10 seconds into rounds. and as for your aim, like i said, hardest setting bots are tricky to get a decent shot off at. so no worries, ** aim will improve a lot to.
ags