I recommend Batman: Under the Red Hood (if you haven’t read it already). It’s a classic (2005 I believe) and if you’re interested there is a movie (this has a matching title, I’m not referring to the new Death in the Family movie that just came out). There are some things that are different from the comic in the movie, but the main story isn’t lost, just a few details.
If you like Under the Red Hood, then Red Hood: the Lost Days is a good follow up prequel story.
Red Hood and the Outlaws rebirth volume 1 is my all time favorite and it gives you more of a view point on Red Hood’s character. This series is probably what makes connecting to his character easier, and this is the pathway that DC has put him onto now.
As for shows, like @Reaganfan78 said Stargirl is pretty good, especially if you enjoyed Justice League Unlimited, and that show gives you a chance to look at characters that aren’t as mainstream. It also has a cool retro aesthetic too.