The following article is located at: http://www.christianitytoday.com/le/2010/summer/leadingprayer.html
Some traditions use set prayers. Others rely on extemporaneous prayers. Both have their place. But I believe what our congregations need most are studied prayers, well prepared, well expressed. These prayers may or may not be read, but will be thought through ahead of time. Publicly leading a church in prayer deserves thoughtful preparation.
1. Use forms with freedom. Learn from The Valley of Vision or Hughes Oliphant Old or the Book of Common Prayer. But suit their prayers to your own purposes. The Didache, after laying down set prayers for Communion, also allows "the prophets to give thanks however they wish."
2. Pray Scripture. Don't just ask God for what we want. Let him teach us what we should want.
3. Don't footnote. Charles Spurgeon: "It is not necessary in prayer to string a selection of texts of Scripture together, and quote David, and Daniel, and Job, and Paul, and Peter, and every other body, under the title of 'thy servant of old.'" The Lord already knows who said everything, so don't tell him again in your prayers.
4. Leave the preaching for the sermon. Don't exhort. Don't explain texts. Don't unpack complex theology. Spurgeon again: "Long prayers either consist of repetitions, or else of unnecessary explanations which God does not require; or else they degenerate into downright preachings, so that there is no difference between the praying and the preaching, except that in the one the minister has his eyes shut, and in the other he keeps them open. It is not necessary in prayer to rehearse the Westminster Assembly's Catechism."
5. Share some details of congregational life, but not all. A good shepherd will often mention by name various sheep that need special care. But don't try to cover every engagement in the last three months or surreptitiously announce the youth retreat in your prayer ("Lord, be with our young people gathering this Friday at 5:00 p.m. with their Bibles and a sleeping bag"). Spurgeon once more: "There is no need to make the public prayer a gazette of the week's events, or a register of the births, deaths, and marriages of your people, but the general moments that have taken place in the congregation should be noted by the minister's careful heart."
6. Pray so that others can follow you easily. The goal is edification (1 Cor. 14:17). So don't let your sentences get too long, too flowery, too ornate. If you write out your prayers, write for the ear not for the eye. On the other hand, don't use distracting colloquialisms like, "Lord, you're so sweet."
7. Keep it relatively brief. Better to be too short than too long. Five minutes is plenty in most North American churches. Seven to ten minutes is possible if you are experienced and have trained your people well.
8. Remember you are praying with and on behalf of others. Use "we" and "our" (as in the Lord's Prayer). This is not the time ...