Divorce and Child Custody

I have been married for over 2 years, We have a son who is 1 year and 5 months old. I have reached a point where I cannot live with my wife for the following reasons - Failure to do basic duties of a House wife - Physically and verbally abusing me - Failure to do her duty as a parent - Bad mouthing me and my family behind my back - Ruining my career due to her behaviour I left her at her parents house 1 month ago along with our son. Our elders have tried to reconcile the relationship but no success in that. She and her mother are adamant we should give her one more chance but this has been done on a couple of occasions in the past and I am not willing to give her anymore chances. I feel threatened to live in the same house with her, all I want is my son as I know she cannot provide a good lifestyle to him. So they said they will wait however long for me to take my wife and my son back but as I suggested I don't want my wife in my life anymore and I want to provide a good life style to my Son. Can I serve a Divorce notice to my wife? After I serve notice if they agree for out of court settlement is it possible?? I am currently unemployed because I left my job so we can live with my parents in the hope that her behaviour will change if we live with my parents. I do not have any properties or income at the moment can she still ask for alimony or maintainance ? What kind of proofs do I need to show in court so I can get my child's custody? I strongly believe she has a physocological problem, she says things and does things when she is angry and says she never did them. I have a few voice recordings of her abusing me and some recordings of her bad mouthing me behind my back can these be used in court ? Can you please help?