Legal procedures to be followed to obtain a Divorce

Hello Iam sharing my family issue in short and seeking legal opinion on the same Iam a girl in my mid 20s and living with my mom dad. My mom has faced a past history of around 2 years of verbal abuse when she was initially married and staying with her in-laws. At a point of time, when it became difficult to stay along, my mom & dad separated from the in-laws house. From that time onward till today, my dad has somehow managed the livelihood but was never able to give me or my mom a peaceful life, since there was no steady job / business and whatever cash he used to earn was put into share market, which finally resulted in loss and lakhs of financial obligation Whenever my mom questioned him of his mis-management of cash, he used to abuse her & her family, call her illiterate and stupid and insult her and has beaten her also at times. But since iam her daughter and because of society my mom just compromised and stayed back. He has beaten me also, when i tried to protect my mom. Recently the fights have increased, every 10-15 days for silly reason, he starts shouting & abusing us, even though we keep as quiet as possible, but he keeps on provoking us, and uses statements like, "get out of my house", "jump down the flat". Moreover, he has no source of income now, and i have been taking care of house for a year or so, but still he has no respect for us and finds reasons to abuse us. Day by day his behavior is getting worst. Me and my mom cannot stay with him anymore. Kindly suggest what can be done to obtain a divorce from him, so that i & my mom can get separated from him and stay peacefully.