In order to use them in your scene you will need to append the brushes to your current file by navigating to the "Brush Folder" and selecting all 14 Brushes. They are easy to identify as they will have thumbnails. Make sure Blender's File Browser's display mode is set to "Thumbnails".

For best results when sculpting use the Multires Modifier with as many subdivisions as your computer will allow. You can always bake the detail when you have finished the sculpting process.