Not all homonyms are created equal, and not every example will render desired results. Indeed, your miles may vary with every homonym pair. Start listening to people and how people's statements can be interpreted differently from how they intended. Also, there are great spots online to find out more about homonyms.
Here are a few examples of homonym pairs provided by Weber State University and Alan Cooper's Homonyms that you will frequently encounter:
Accept (to receive) and Except (excluding)
Acts (things done) and Ax (chopping tool)
Ad (advertisement) and Add (short for addition)