If your interested in the DC / Marvel world then you should definitely get some comics and explore it more. There is alot of things mentioned in the comics that are not in the movie's/shows, characters you never knew existed and so on.
Thing about comics now is there very cheap cause now people want to read online for free, So sites like ebay/amazon you can pick up a ton of comics for next to nothing and its good actually sit with the comic in your hand and appreciate it more than online.
Also look in some little comic book stores, usually have bundles for cheap also, it gets very addictive.
Been collecting comics for years.