How to file case for interim maintainence

I walked out of a abusive marriage which lasted for 9 years with my 2 kids, aged 6 years and 2 years. I am living separately with my parents here in Kolkata. I had filed a FIR way back in 2012 but my husband asked for forgiveness and to save my marriage I had gone for reconciliation. Again he repeated his abusive nature and he physically, verbally abused me in 2013 when I was pregnant with my elder daughter. This time I came back to my parents n filed DV case . The case was filed and it stretched for a year and again he tricked me emotionally and convinced me that he has changed and he will not repeat it again. Hes a pretty smart m cunning guy and I had appeared before the Magistrate and told him that everything has been sorted and I want to give my family back as my kid needs a father. He took us along with him to his hometown and we started afresh our new life. Things were smoother with in between short fights n abuses .but got nastier when my son was born. He assaulted me always in front of my kids. So this time I took a stand n left the place with both my kids and this guy to be out of my life.Its been 6 month he hasn't paid a penny to us though he has a huge property worth 5 crore, Alto car , 1 royal Enfield bike. Hes got shop , flat in rent m earns 1lakh monthly. Am not working now cz my son is too young and we depending on my younger brother. My lawyer hasn't yet filed Interim for maintainence as I m running to court for last 5 months saying that hes trying to mutually settle the matter with my husband out if court. I am depending on my brother for kids fees, medical etc. He even kept back my luggage, jewellery, official documents and did not allow me to take them when u left his home. Kindly advise! Thanks