Tasuric; Welcome to the U-Boat nuthouse Herr Kaleun.
My guess is your running stock SH3 and getting your feet wet. That's fine but down the road you'll probably consider a mod or two perhaps one of the supermods (GWX, WAC, NYGM). Each one of those in their own rights adds difficulty and harbour traffic PLUS defences the stock game lacks.
If you want to get a taste of good harbour activity take a look at the Harbour_Traffic_147_standalone mod. That, turns stock SH3 into a good game, and will start you on the path to mod addiction.
I can't imagine not starting a game without SH3Commander anymore, that program lets you make good tweeks. If you haven't already read up on a program called JSGME. It's a mod installer for the game oviously, most mods are packaged to be used with it for ease of installation.* Please Note; before you install any mod when using Commander rollback and reset any T/C adjustments first.
Now, prepair ye to loose sleep, part of your life, and don't worry about hair falling out.
*GWX has it's own installation routine and cannot be uninstalled with jsgme.