Arno, about the mission... you might be able to see the kilo at the surface leaving the harbor, but i'm not sure. If he's not at the surface get as close as poss (would say not less than 5nm) and take an angle to show the Towed Array to the entrance. In shallow waters you might have to stream it out at a fraction of his max length in order not to scratch the bottom.
About TMA, it's usually the last thing subsims players get into, as it needs a lot of practice to be effective.
The link Fish gave you will cover you with a good quantity of documentation to start off...
If you have more questions, dont be afraid to ask
