This was so touching to me that you're really going for this :) And I love the idea consulting with ChatGPT to familiarize yourself with crime drama vocab. Crime dramas were some of my first introduction to Finnish and it was quite hard to understand, but it gave a strong cultural connection. In my first meeting in a cafe with a Finnish expat, we talked about these crime dramas and our opinion on the actors. Media is such great common ground for native speakers.
Best of luck and have fun. Can't wait to hear about the results!