To become a leader, you must develop both character and vision. For this, it helps to read biographies of great leaders. This has been recognized for thousands of years. Plutarch, a Roman politician and writer, wrote the Parallel Lives, in which he compared the characters of Greek and Roman leaders.
I recommend the following. If you are interested in business, consider reading a biography of a successful businessperson, such as Walt Disney. If you are interested in ministry, consider reading a biography of a missionary, such as David Livingstone or Gladys Aylward. If you are interested in science, many individuals would be good choices, in particular, Michael Faraday. He is a true rags-to-riches story, and he changed the world. If interested in politics, it’s hard to beat George Washington and Winston Churchill.
Identify what they did well. If you observe a great habit, write it down and try to put it into practice. Note their mistakes and how they handled them. Also, note their vices and moral failings. Reading a biography is like eating chicken: enjoy the meat, spit out the bones.
The best biographers tell a good story and are accurate, revealing the true essence of the person.
Churchill quite literally saved Western Civilization during World War II. His rise, and fall, and rise is a fascinating story. Some consider him the most excellent leader of the 20th century. I recommend reading Paul Johnson’s short biography of Churchill.
Warning: once you start reading about Churchill, you may not find it easy to stop.