When I started out as a newbie I looked all over for any tips or guides and just couldn't find much out there, So now I'm a bit more seasoned as a sniper: I've written one!
Take a look at
http://www.geocities/sniperguide/sniperguide.html
If you are new to mohaa or just thinking about specialising in the art of the crosshair you may find something in it to help.
Cheers