Alimony and maintenance

I am 40 yrs old male, father to two sons 8 and 3 years old respectively. My wife is twelth grade educated women, with work experience of above 6 years and is aged 31. Due to the internal fights and arguments we are now not intimate with ach other. I also personally like another women and is looking forward to marry her post divorce. The concern part is my wife's relatives has been threatening me and my family on various occasion for various things. My wife restricts my kids to meet and talk to me as well. Now they want me to leave my job and settle along with them which I do not wish. Further, they have send an advicate stating that she would file a complaint for her maintenance money. I earn a salary of 32000 and have loans and credit card obligation. However, I still pay the fee of my kids which comes to 8100. Can you please advise if I go ahead and file a divorce what is the alimony that I will have to pay approximately apart from the kids fee of 8100? Also she has threatened that she will resign the job and then file a complaint. Request you to please guide and advise.