It took me years to figure out how simple it is to meditate:
Close your eyes and aim your attention at your nose. At this point, do not breathe, instead let your body breathe for you. When a thought inevitably occurs, notice that your eyes have shifted focus from your nose, simply return and attend to where your breath was left.
This builds up concentration and an empty mind. If you find it difficult to follow these words, there is this image here: Be sure to mimic it.