At the top of my hat, you can find some important info from here:
http://www.commanders-academy.com/fo...hp?do=cat&id=7
http://www.subguru.com
But honestly, DW isn't about lobbing rockets or torpedos on target for instant gratification. It's all about using the technology to find, identify, track and finaly persecute the target. Or not!!! If the rules of engagement don't allow you to. This is a patience and stalking game, not a FPS.
The game manual tells you "what" those buttons do, but not "when" to press them. That's where the documents of the above links come in. But you can't do without the manual. Atleast not the sections related to the vessel or helo you are playing in. You don't have to read the entire manual all at once.