How much does a tuition/psc teacher earn in Kerala

Disabled woman, with lots of familial issues here, i am currently pursuing MSW.i am planning to start a tuition center along with psc and ssc chsl and spoken English coaching, i live in a city with a numerous coaching institutes, i am planning to create posters and distribute, and creating a google ad, but one of my relatives told this will not work, and only online promotion works, but i don't think it works at this stage, what should i do, how much should i charge, how to gain students, provide insights.