Affidavit: usually, we ask you to prepare this affidavit. In this affidavit, it should be written your name, address. Have a look sample affidavit.
You need to prepare your passport, resident card/a resident identification case in your country.
If you can find good property by internet, you can propose the buying offer.In this case, You need a Deposit Receipt Offer And Acceptance and 10%-20% of deposit payment.
Or if you want to pay everything on contract day time, you can.