As you are only 16 years old, you can enrol yourself in a good cricket coaching academy in/near your city to hone your skill. Thereafter, start playing for league cricket in the capital of your state. Work hard, practise seriously and have determination. If you have denuine promise you will play in the sub-junior, junior level of your state and later you can make it to your state team. You will start playing first-class cricket and ODI/T-20 at state level.
If it is not possible fo you to join a cricket academy due to financial constraint, meet a cricket coach in your city who coaches junior/sub-junior level, convince him with your skill and ability and start training under him.
Getting selected in the Indian cricket team depends upon your ability, level of fitness, level of development, diligent work of highest order, determination, attitude and to some extent luck.
Age is on your side. Best of luck to you!
Beware! I question everything and everybody.