Aside from Scripture, I've found Richard Baxter's The Reformed Pastor to be the most helpful book I've read on the calling of the teaching elder (pastor). Baxter's work is also extremely helpful for ruling elders. Strauch's Biblical Eldership is about the only contemporary book being read today on the eldership but I'd discourage its purchase or use due to Strauch's potent anti-clericalism. When I read him years ago, I found him to have a proudly disimissive attitude toward pastors that bore more resemblance to the galloping egalitarianism of American culture than, say, the Pastoral Epistles. But more on this later...
Here's the section of Baxter I quote more frequently than any other. Baxter is responding to those who object to pastors preaching to the conscience:
They say, "You are so precise and you keep talking about sin, and duty, and make such a fuss about these things, while pastor so-and-so, who is as great a scholar as you and as good a preacher, will be merry and joke with us and leave us alone, and never trouble himself or us with this sort of talk. You can never be quiet and you make more commotion than needs to be made; you love to frighten men with talk of damnation, when sober, well-educated, peaceable (reformed) pastors are quiet, and live with us like other men."
(People) will give you leave to preach against their sins, and to talk as much as you will for godliness in the pulpit, if you will but let them alone afterwards, and be friendly and merry with them when you have done, and talk as they do, and live as they, and be indifferent with them in your conversation. For they take the pulpit to be but a stage; a place where preachers must show themselves, and play their parts; where you have liberty for an hour to say what you (desire); and what you say they regard not, if you show them not, by saying it personally to their faces, that you were in good earnest, and did indeed mean them. -Richard Baxter, The Reformed Pastor, (Banner of Truth, Carlisle PA: 1974) p. 85.
By the way, here's a page with a picture of Strauch among the other speakers at Doug Phillips Vision Forum's recent third annual Conference for Uniting Church and Family held in St. Louis this past week. Strauch and Phillips working together makes theological sense to me.