The aim of these shots is to get your customer to envision what it would be like to have your product, essentially to imagine how their life would change once they brought your product into it. Good lifestyle photos will strike a chord with your customers emotions and get them dreaming about your product.
Now every business, product and brand is different and therefore the way that you approach this style of photography will depend greatly on the message and story that you want to share. Think hard about what that message is and how you can convey it in your image.