You should start with the early Black Panther comics. Then, follow the series chronologically. Make sure to look for any crossover events that might involve Black Panther.
Following the introduction of Black Panther in 1966, his character gained a dedicated fan base. He was featured in crossover events and team-ups with other Marvel heroes, expanding his influence and story arcs.
The Black Panther comic has its own unique fictional universe and narrative that is not related to the Black Panther Group. The comic's creation was based on comic book concepts and storytelling rather than any direct connection to the group.
The Legend of Black Panther is an audio novel that can be listened to for free. However, the search results did not provide clear information on which platform could be listened to for free. Therefore, I don't know the specific platform for free listening to books.