I’m not a big fan of the DC movies, compared to marvel they just are not on the same level in movies on the other hand I believe DC knocks it out of the park with there tv shows. DC is better with shows marvel is better with movies. If I were you I would definitely get into the whole arrowverse of DC shows which include Arrow, flash, black lighting, DC legends, supergirl and more and they are all connected and have crossover episodes. Start with arrow it’s an amazing show I started watching the flash first which is a little out of order in the way your supposed to watch the shows but I eventually got them in sync and it was amazing