Badminton is a great game. My favourite player was Lin Dan. This is the right age when you should target your goals in becoming a good player.
You can go ahead reading about some of the best badminton players in the world and how they train themselves.
This will give you some help in becoming a good/better player. You need to train hard for such games, as they require strength and agility.
Getting in touch with a good coach/mentor is utmost important if you really want to excel. Coach can always suggest/advice you the changes that you need to bring in your way of playing to become better and better. As they will analyse the way you play and note the mistakes that you make on court during matches. They will also suggest you the tournaments you should go for, which in turn will help you to get success. In order to play for the country you need to prove yourself at different levels, specially at national level.
Abhishek recommends the following next steps: