No. of small factories in a Residential area since past 10 years

Hello There has been a number of small factories of making plastic dolls, idols etc. for the last 10 years. In last three - four years, they occupied the much more space and landlord had made a building for them also. It causes Noise and Air pollution 24 x 7 in the colony. No. of workers is more than 50. There is also a security issue and it disturb the daily life of residence. Issue of child labour is also there. They give bribe to police every now and then. Please tell me the procedure of complaint and to whom I have started with.(like MCD, CM office, police etc). Online complaint is enough or should I post the hard copy of letter. Did I need the sign of my neighbors. Did I require photos for future reference. Please tell me the procedure and how I should plan these thing step by step