Initiate Divorce without present in india

Hi , I work and live in Singapore during last 4 years. I am married about 4 years back. From day 1 we had issues. our marriage wasn't consumed. I tried for first 6 months to keep our relationship with help of my parents and relatives on both sides but all attempts are failed. Later I moved to Singapore, both of us busy with our professional life and didn't try to mend this problem for a year. Later again tried when I went india but failed. So we tried multiple times to keep our relationship , but we failed. So far we don't have any physical relationship. We speak only on phone after our marriage she never tried to meet me personally not even once, I tried to meet but she always refused. Now I fed up with this unsuccessful relationship, I don't have any more hope and want to end my marriage. I would like to initiate Divorce process in india now. I understand I don't need to be present in india to file divorce, I want to know more about how frequently I need to travel to India after divorce filed and process wise how much time it will take if she don't agree for divorce. And legal fees and any other things I need to be aware before filing divorce from my side . Thanks