How to divorce with wife after around 7 years of maariage

Hello I am a self employed person and married 6.5 years back . My wife is almost having pg degree but almost zero knowledge and from very poor family. My parents was looking for a girl from poor family to support her.But she is always ready to fight with me. I have two girl child one year and 5 years. She never allowed me to do my job work as she dos'nt know what is job or self employed work. Her demand are very high and she think i stay the whole day to attend the child care but lakhs of money per month should come. She tortures me everyday and if i tries to say anything or deny for everything she simple go to bed and lying there same with couple of days or even for week without doing anything.she is also teaching the same lesson to the child. I was not prepared for second baby but she force me for that now she force me for third child as well. If i go to office she not allow me to go before 12 pm and started to ask around 5 pm to come back to help her for home work and attend child. If i am 15 minutes late becomes very angry. If i stay some more time with her i may commit suicide so now thinking for divorce .Her family is the same always support her and only say not a problem let her do what she wants.Maximum they say ok drop her to us house 300 km from my house and after one week they say come and bring her .All jewelry she had taken to her parents house and kept there. Please suggest me how can i file divorce and what counter she can do against me. For how much amount she can claim as maintenance . Which preventive action or evidences should i collect to protect me and my family from false allegations she can once know i filing divorce .