How to apply for divorce when staying in Australia?

1)I have faced immense mental torture from my mother in law and my husband.My husband turned a blind eye to the misbehaviour of my mother in law.Due to negative environment in the house he even asked me to abort 4 times.After lot of suffering when I wanted leave him he agreed to separate from his mother.But his complete refusal of acknowledging his mothers wrong doing and subsequent taunts from him that he had to leave his mom because of me ,I have come to decision of divorcing him for mental peace as I don't want to live in continuous negative environment of mental harassment 2)can the above circumstance be reason for a divorce? 3)since I am living in. Australia how can I and where do I have to apply for divorce .we had registered marriage in nagpur,do I need to apply there and do I have to be present there while applying for it? 4)Together we have taken A joint home loan for a house in Australia for which I paid the full deposit amounting to $45000 and each of us pay 50% of the monthly repayment,how will that house be divided? 5)How many times I/we will need to come to india? 6)I have a feeling he may contest the divorce however I will request him to mutually divorce ,how long will each of this process take if it swings either ways?