In the comics, M'Baku is not typically considered a villain. He may have his own conflicts and challenges, but he doesn't fit the traditional villain mold. He has moments of cooperation and conflict with other characters depending on the storyline.
The Black Panther in the Marvel story is a really cool and important character. He is the king of Wakanda, a technologically advanced African nation. He has enhanced strength, speed, and agility thanks to the heart - shaped herb. His suit is made of vibranium, which makes him nearly indestructible in battle. He is also a great leader, protecting his people and Wakanda from various threats.
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.