I have found the collection of prayers in the CW Pastor’s Companion, as well as the LSB Pastoral Care Companion, to be quite useful. Here is a pastor’s prayer as he prepares for Sunday morning. The version is from the CW:PC.
O God, Father, Son, and Holy Spirit, I humbly pray: pardon all my sins. Look not on my great unworthiness but on your great mercy, by which you have appointed me to be your ambassador in Christ’s place. Put your Word in my mouth and speak with my tongue. Bring forth fruit through me, your unworthy servant, and let not the preaching of your Word be without effect among us. May all that I utter be in accord with your will and the confession of your Church, that your name may be glorified, your congregation strengthened, and your Church built up.
Let the praises of the Church be acceptable to you. Keep us from vain babbling and lying lip service. Preserve your Holy Word among us that it may be joyfully and boldly proclaimed in its truth and purity. Guard us in the right use of the Sacrament in accord with the institution of Jesus Christ our Savior. Be our God and our children’s God, now and forever. Hear my prayer, O Father, for the sake of your dear Son.
Christian Worship: Pastor’s Companion. Northwestern Publishing House, 2004, p. 11.
See also: LSB Pastoral Care Companion. Concordia Publishing House, 2007, p. xix.
Note: Both of these volumes are very valuable to me. I hope to write a comparison of the two books sometime in the near future.