First, you will want to have all your financial documents in place. Making an offer on a house isn't just about telling the seller how much you're willing to pay.Your main objective in constructing your offer to purchase is to purchase the home you want at the most favorable terms possible. 1. REAL PROPERTY: Purchaser agrees to buy and Seller agrees to sell the land and all improvements thereon located in the. The first step to making an offer on a house is to get preapproved for your mortgage. Approval is a dress rehearsal for your mortgage. 1) Names of the parties to the contract,. 2) Description of the property,. This offer is an extremely important document. It lists the price, terms, and conditions under which you agree to purchase the property.