Hello Nikhil!

To become a commercial pilot :

1. First , you have to obtain commercial pilot's license, whose eligibility criteria is that you should be 18 years old and should have good communication skills. Also , for this a physical exam is conducted.
2. Now , you can learn the basics of the process of flight ,for  which many flight schools offer recreational or private training courses this will help you.
3. Now ,to become licensed, commercial pilot you must pass the Federal Aviation Administration (FAA) practical test, which is administered by a registered official.  (If you want more information regarding this test please fell free to ask)
4. Now , last to become licensed as an airline transport pilot you need to complete some basic eligibility criteria such as you should be at least 23 years old, have a minimum of 1,500 hours of flight experience, and pass FAA examinations.

Hope it helps !