This includes information about the rights and expectations of each party in the agreement, which is why it is important to have the contract checked by a lawyer before signing. It is always a safer bet to make your promise in writing so that it can be pronounced in court. To find out what`s in a sales contract, see the following steps. Describe the transaction. Identify the goods for sale, their means and their delivery date. In some cases, it may be necessary to indicate the condition or assembly of the goods sold. All additional information to be communicated to the other party must be indicated in the sales contract.