How is property divided between legal heirs?

In our family, head of the family has lost his wife. He has more than one legal heir/married children. He has immovable assets like Fixed Deposits in Banks and Jewels. He has inherited agricultural properties. He has no business income and his sole income is from inherited agricultural properties. Out of income earned from inherited properties, he has bought certain agricultural properties. Queries: 1.Are properties bought by him to be treated as inherited or self acquired? 2.If he wants to write a WILL for any of the bought out properties in favour of one legal heir, leaving out other legal heirs, would it be valid? 3.After his death, all assets have to be shared between legal heirs. Is it correct to say that till movable assets are divided, share of immovable properties between legal heirs can not be decided? 4.Can any legal heir sell his/her undivided share in immovable properties (bought by father) before dividing the parcel of immovable assets?