Here's some tips for aiming...
http://www.edgegamers.org/forums/showthread.php?t=161813
Take a look at this thread by Ill Legend. A lot of tips/guides in there for cs:s!
http://www.edgegamers.org/forums/showthread.php?t=83132
If you still want some help add me on steam and I will give you as much help as I can!

I think the best way to get better is not play jail and play dust or office. Dust 2 is really hard with a lot of people! So saying that, I don't think you need training, just practice.
, let play sometime!
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