How me and my son will be benefited after divorce

Sir,I have 9 years married life.Ihave a 7 years old son,who is with me.I am doing a job as a teacher in a private school and getting Rs12000 which is sufficient at all for both of us. As l have separated from my husband since 5 months and decided to go for divorce.The first of my married life was not bad.But with time I came to know that my husband has lied to me that he is a graduate and he is preparing for MBA but actually he left college after 11th only.After 4months of our marriage he sold away all my gold jewellery.Everyday came to home by drinking alcohol and physically and mentally he harrased me a lot.By the time I got pregnant and given birth a boy...But the medical expenditure has been taken care by my father.Iwas expecting that he would change after becoming a father....But day by day his behavior not only for me but for the child was so rude.What ever he was earning spending on showing off the status whether basic necessary were there are not.Now I came to know that he is having adultery relationship with other woman .So now it's extremely not at all tolerable to be with whom stay under one roof.One flat is there on my name but he is theco-applicant .Can I claim on his income and on the house?How much time all the procedure of divorce and getting alimony will take.Kindly suggest me the right way.Regards Shibani