If you regularly plan worship services and are looking for inspiration or assistance, you should consider purchasing The Worship Sourcebook.
Originally published in 2004, The Worship Sourcebook is a collection of "prayers, litanies, and other resources compiled for easy use." At over 800 pages long the book is an exhaustive resource, however, its table of contents, indices, and appendices make it a resource that is fairly simple to use. For example, let's say you are beginning to think about planning a month of Advent and Christmas services for this December (I know it's only May, but we're all way ahead of the game....right?). The Worship Sourcebook contains over 70 pages of Calls to Worship, Prayers of Adoration, Scripture Readings, Prayers of Confession and Assurance, Creedal Statements, Offering Prayers, Communion Prayers, and many other resources just for the weeks of Advent and Christmas.
The Table of Contents in my first edition copy is divided into two sections:
Part One: Elements of the Worship Service
Opening of Worship
Confession and Assurance
Proclaiming the Word
Prayers of the People
Profession of Faith and Remembrance of Baptism
The Lord's Supper
Closing of Worship
Part Two: Central Themes of the Christian Faith
We believe in one God...
We believe...in one Lord Jesus Christ...
Baptism of Our Lord
Ascension of Our Lord
Christ the King
And we believe in the Holy Spirit...
Unity of the Church
Communion of the Saints
Under each of those headings are dozens of worship planning resources.
The Worship Sourcebook is written from a Reformed viewpoint and its contents will be easily incorporated into services in the Reformed tradition. However, even if your church is not part of that tradition you will find a lot of help here as you choose Scripture readings, think through how to begin and end services, consider topics for prayers, and plan all of the other elements of your services. For example, the following pages from The Worship Sourcebook list names or titles of Jesus along with the corresponding Scripture passages, names of address for the Holy Spirit along with supporting Scriptures, and actions and attributes of God. These are components that you will find helpful no matter the church tradition you are ministering in.