Bryan over at Hevel.org has started and intermittently adds to an introduction to the Old Testament prophets. These posts are helpful as they are written for the general reader and they are succinct. If you are looking for a more thorough introduction to the prophets I have linked to a couple of texts below that might be helpful. Or, you may want to check out the Yale Open Course introduction to the Old Testament which I have a link to on the courses page of this site and which is free. However, if you are looking for a good succinct introduction check out Bryan’s blog and make sure to sign up for his feed, so you will know when he adds future posts on the topic.