Taking the classes and passing all the tests. Plus you need the flight time for practice.
Go to school.
1912 was when the first helicopter flown
The first helicopter was made in 1909.
the first thought of the helicopter was in 1787
The first helicopter was called the VS-300.
The first Helicopter was made by Igor Sikorsky, in 1939.
No, the first practical helicopter was made in 1941.
Sikorsky's V-300 was the first practical helicopter.
Igor Sikorsky made the first practical helicopter
Igor Sikorsky made the first practical helicopter
You need to get a flight physical, attend ground school, pass a ground-school test, attend flight school, then pass the FAA oral and practical exams. Flight instructors from the school close to my office (I work on the perimeter of a small airport) tell me it's about $10,000 LESS expensive to learn to fly an airplane before you start learning to fly the helicopter than it is to learn to fly a helicopter first. Check philip.greenspun.com 's section on learning to fly a helicopter; he goes into it very well.
Igor Sikorski constructed the first successful modern helicopter