I would suggest that you consult with a local real estate lawyer, who can explain the contract to you so you can complete it properly. If you come to an agreement with the seller, you can say that you'll have the formal contract prepared in a couple of days for the seller. Do not sign a contract that you are not familiar with! You may end up in more hot water as a result.
Good to hear @Account Closed ! Good luck!
Pay him by the hour. Let him suggest title search etc. Disclosures, inspections etc.