1. Choose a house. It can be one you've known, or you can choose one from a picture. Describe it - imagine what kind of person might live in it. What do you think it would be like to live there? It's going to be the setting for a story. See pictures below for some examples.
2. You have quite a while before the next lesson, so I would urge you to use it to do some covert observation - in a cafe, on the street, anywhere. Pick on a person and observe them; describe them, search for clues so you can imagine what their lives are like. (But be discreet!) Don't stop at one - make a habit of it! Carry a notebook, so that (obviously) you can make notes.