1) since deceased died intestate leaving behind movable and immovable properties you need to obtain letters of administration from district court
2) enclose relative death certificate . Mention name of legal heirs of deceased
3) it does not take more than 6 months
4) you have to pay court fees depending upon market value of property and as per court fees act of state
5) succession certificate is only for movable properties and has to be obtained from district court
6) legal heir certificate will not serve the purpose . lHC also has to be obtained from court