Choose an object that has a personal meaning to you, maybe an object that has a certain memory attached to it or an object from a collection. Place the object in front of you on the table and draw it. It is usually best to start very lightly with the large shapes, directions and proportions. With a good eraser at hand, you can make improvements. See if you can work with shadows. Save details for last. Remember it still is a drawing and does not have to be fotorealistic.