Hello Aditya

Please read this article.

Football Trial

Tip 1: Make Yourself Available in Game and Training Situations. It's important that you don't shy away from the ball. You want to get involved in the play as much as possible. Find space to receive the ball and always communicate when you are available.

The only age requirement for professional football contracts is that the player must be 16 or older. So yes, at the age of 26 you can sign a contract. How do I become a football player if I have the talent but there's no local club around me?

You can join any coching Institution.

Top Football Academies in India

1. Indian Tigers Football Academy (ITFA) Indian Tigers Football Academy was established in the year 2008 by Chelsea players - Sherley Singh, David Lee and Gareth Hall. ...
2. Bhaichung Bhutia Football Schools (BBFS): ...
3. DSK Shivajians Academy. ...
4. Paris Saint-German Academy India. ...
5. BOCA Juniors Football School India.

Hope that's helpful

Best of luck