When a local congregation holds the Bible as its authoritative source document in a post-Christian milieu and embarks on developing a ministry plan, it should base its plan on the Bible as the revelation of God. One aspect of a ministry plan of a local congregation is the service ministries (διακονία). In this article, I attempt to answer the question what previous exegetical studies by the author and other researchers of the diakon-words in the New Testament could contribute towards the development of a biblically based ministry plan for a local church. The principles for service ministries identified from the results of the previous exegetical work, are presented in an overview and integrated into a plan for service ministries. The conclusion is that the exegetical studies of the διάκον-word group in the New Testament have provided valuable insight into the service ministries and therefore contribute to an overall ministry plan of a congregation.