Get a hold of the International Standard Bible Encyclopedia, in the second edition. You will find loads of help there on almost every Bible topic. It gives more info than a standard one-volume dictionary, which you would rather quickly outgrow. If you want even more information than that, I would go with the new IVP reference dictionary set, which has one volume on every major section of the Bible. The one on the OT prophets is still in preparation. It's more expensive, but also worth it. Beyond that, I would actually recommend commentaries. I have a commentary suggestion post on my blog for less technical but still helpful commentaries
here.