The Bible is plain in its teaching about church leadership--each congregation was set up autonomously with spiritual overseers, also known as bishops or elders.  All Christians are servants, but in the New Testament we find examples of churches appointing men specifically to ensure the work of the church was handled efficiently. These men are called deacons and their qualifications are spelled out in 1 Tim. 3:8-13.

"Deacons likewise must be dignified, not double-tongued, not addicted to much wine, not greedy for dishonest gain.  They must hold the mystery of the faith with a clear conscience.  And let them also be tested first; then let them serve as deacons if they prove themselves blameless.  Their wives likewise must be dignified, not slanderers, but sober-minded, faithful in all things.  Let deacons each be the husband of one wife, managing their children and their own households well.  For those who serve well as deacons gain a good standing for themselves and also great confidence in the faith that is in Christ Jesus."