Husband forced to leave house and now shifted to abroad but I want divorce

I got married in Nov 2012. After 1 year of marriage, my in laws and husband started threatening me for divorce including mental torture. I was working in another city(2014-15) so in order to be with him and make peace I left my job and started living as a house wife in 2015.Gradually he started beating me, not giving money, abusing me etc. In June 2016 when he beated me badly, i told my parents. Fearing police action he left home and in next few days sent me a legal notice. And on next day, he filed police case against me that I had beaten him and want me to go back to my parental home. Still I tried to make peace and talk but he didn't returned. He is the only son so very irresponsible and stubborn. Atlast, I left his home and came back to my parental home in june 2016. For 3 years I waited for him but he didn't came. Recently I got news that he resigned his job and shifted to Australia for higher studies. Now I want to claim for divorce, maintenance for 3 years, stree dhan, my all belongings, household item given to them in marriage. He was earlier in government job so can I get maintenance for last 3 years and as he is now studying so will I get anything as future maintenance. I don't know where his family is living in india(they are not picking my phone) or he is living in australia so how could I send him divorce notice? Can it be send on mail or social media. What if he didn't replied or don't came to India, then can I take any police action. Please clarify.