Buying a House,

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I am in process of buying a house in Lahore [Not DHA or proper society] and I dont know all the legal requirments as this will be my first property.
Can someone guide me how I can make this transaction clean without any issues, my questions are

1- How I can check if there is any loan against this property?

2- How can I transfer house on my name, the seller is asking 50% at the buying time and remaing 50% in two months?

3- what is the way to check if all the taxes are paid for this property.


Really appericate help on that.

thanks