Commentaries will give you verse-by-verse commentary on your particular passage; however they will also supply other information in the introduction to the biblical book and reflections at that may come at the end of the section.
Look for the volume on your biblical book in the Interpretation Series. Individual books are also available in the JPS Bible Commentary Series. There are a number of other fine commentaries available as well. Choose the most recent ones. Nothing from Calvin or Spurgeon! Make sure you know the perspective of the publishing house.
(Suggested resources and notes are from Dr. Bratcher.)