1) enter into agreement for sale with the seller. check whether original title deeds are with seller . take inspection of records from sub registrar office
2) agreement for sale should provide that on full payment being made sale deed would be executed within period of 3 months and possession handed over to you . time should be essence of the contract
3) dont make 50 per cent black payment . the reason being if for some reason sale does not go through seller would only refund payment made by cheque . the cash payment would not be refunded .
4) get agreement drafted by local lawyer . no need to register agreement for sale