Thank you! Those films are a great place to start, they're so pretty! If you're looking for another Lupin movie to watch, I'd very much recommend Fuma Conspiracy. I think the animation in it is even better than legend that is Cagliostro (hot take, I know, sorry), and you'll get to see how very squirrely the gang usually is.
If you're looking to get into the show, our game is very inspired by Part 2. TMS has the first couple episodes up on Youtube, so it's easy to find a few!
(And as far as spoilers go, I had to! Lupin/Jigen is my favorite ship. I wrote the Jigen ending, and actually had to make myself stop. I almost started writing an entirely new game about them in the car. ^u^; )