Here are the steps to create an Offer on your Business Page:
Step 1: On your Business Page, look for the Create post function and on the right hand side, there will be an Offer icon
Step 2: Click on the icon and a pop-up menu will launch:
Step 3: Upload an attractive photo as per Facebook's guidelines and fill in your Offer details such as Offer Type & Discount Amount:
Step 4: Once you have filled up all the relevant information, you can choose the CTA button that best suits your objectives.
That's it, you have just created your very first Offer on Facebook!