In Delhi, students from all over India come to prepare for Indian Civil Services Exam. and also for various other examinations. Many such candidates give coaching and earn a huge amount of money. I have seen many cases where such students eventually stopped preparing for Civil Services or other examinations and started earning huge amount of money by giving tuition at various levels. But like many other professions, you have to struggle a lot during initial days.
I suggest you to discuss the matter with some of your trusted friends and visit some of the coaching institutes of your locality. You have to explore the locality in detail where you stay, I know that there are many such institutes at Satya Niketan, Ber Sarai, Katwaria Sarai, Mukherjee Nagar, etc. Even at Janak Puri and adjacent Dwarka, you will definitely find many such tuition centres/institutes,
Beware! I question everything and everybody.