1) since you are the purchaser you can ask seller to produce original sale deed . you can take inspection
2) first be satisfied that seller has clear title to the property . dont pay 10%of sale price now
3) only if title is clear and marketable should you pay 10 per cent
4) in many case seller refuses to refund 10 per cent committed price if purchaser backs out of the deal if title is not clear and marketable
5) if on other hand seller agrees to refund 10 per cent paid by you in case title is not clear and marketable you can enter into agreement for sale and pay 10 per cent as committed price
6) agreement for sale would be binding upon both the parties and in case of breach of contract by seller you can move court for necessary reliefs
7) get agreement drafted by local lawyer
8) not necessary to register agreement for sale .
9) sale deed would require registration