Transfer of Property from Father To Son after death of Father

I am a Hindu and My Father has died and has left a registered will in my favor. This will was executed in Delhi. Which includes a property each in Gurgaon, Delhi and NOIDA. My Mother is also no more. I have two sisters who are witlessness in this will at the time of its execution. There is no 0ther surviving legal heir in the family. i) What formalities are needed to transfer of these properties in my name and ii) what is the court / government fees. iii) How much time it takes to transfer these properties iv) Is there any formality required from my sisters also ( one of them is settled and citizen of Australia). If so, what are these formalities Please answer in details. Regards