Hello! You can check out my tutorial series (shameless plug). I go over everything about the game in a technical sense, there's not much in the way of tactics in my tutorials. But since Dangerous Waters is a procedural sim, knowing how everything works is most of the battle:
https://www.youtube.com/playlist?lis...-p2qHIpRNOvpGQ
Also, be sure to read the manual. There's lots of good information there. In terms of first missions to play, I would just start with the default campaign, Russian Rebellion. It's not difficult and starts out easy and gets more difficult as you progress while giving you a try at all the platforms.