Professional footballers are groomed from the age of around 12 years wherein they can be moulded and taught technical skills at the right age when they can learn more. If you are serious about football, start playing for your school/college. Then approach the local football coaching academies and meet a good coach. Please focus on physical fitness, agility, sprint and stamina. Have a good nutritious diet that doesn't make you too bulky.
1.Check on dedicated football coaching academies in your city to understand the training periods and the general plan towards becoming a national junior and then a senior player that will open doors for professional football
For instance in Mumbai:http://pifa.co.in/academy/centres/. you can check the levels of entry for the football trainees, expert videos and important get some contacts
2. Focus on finding talent scout centers/camps around your area or cities that you can travel to. for example, Tata football academy has good training facilities and has talent scout camps. Please check this link, they have talent selection from nov 17- March2018 in various cities of India. Try and see if you can make it to one. It could open doors and give you plans for development of skill and coaching at the next level.http://www.tatafootballacademy.com/selection.asp
3.If you aim to become a pro, then select academies with good coaches and contacts. Check Bhaichung Bhutia football schools that have centers in the major metros of India and also have outstation camps.
4.The Indian Super league football, has a social commitment to teaching football to budding youngsters (https://www.indiansuperleague.com/grassroots), check the site and see if can become a fan of a club in your hometown or the nearest city to get the benefit of the best players in India. The good team in the league will be a good starting point for you to gain expsoure to how life of pro football would be. Go to these matches, try getting the job of a volunteer and try hard to meet players, coaches, additional members etc.
5. Look for active football clubs that also offer training to youngsters. For examples this is the website for Bangalore FC (http://www.bengalurufc.com/), they have soccer schools for talented students (http://soccerschools.bengalurufc.com/).
6. Be focussed, visit match venues, hang around with your father or brother before and after the matches wherein you can get a chance to meet someone in the coaching department you can put you on the right path.
Try multiple options and keep knocking doors until you get the lucky break.