My father want to create a will

Any 'Will' which is made by the person is of fit mental status i.e. is not suffering from any mental illness (should be medically examined & certified about fit mental condition by a qualified medical practitioner/doctor at the time of making the ‘Will’), The 'Will' should be written , mention full details of the Testator , signed (or having the thumb/fingers impression in case if illiterate person making it but is aware of the full contents of the 'Will')  The full details & identification of all the properties which the Testator owns, is in his or her possession or is expected in future & which the Testator wants to be transferred in this manner after his or death should be mentioned in the ‘Will’ to avoid any dispute on this regard amongst the beneficiaries.