Note that the qualifications for church leaders are almost entirely based on character, except that the bishop (overseer) must be able to teach. How many times do you see churches led by a gifted leader who has serious character flaws? In the New Testament churches, brothers with various gifts participated in the services, but the positions of authority were reserved for those of proven character.
General principle: Philipians 1:27,28
Qualifications for Bishops (overseers), also referred to as Elders : I Timothy 3:1-7, Titus 1:6-9; Titus 3:1,2; 3:8-9
Qualifications for Deacons (literally, servants) I Timothy 3:8-12; Acts 6:3
Leaders must not engage in quarrels, be gentle and patient, interpret Word correctly – 2 Timothy 2:15-16; 23-24
Leaders who teach must be prepared at all times, persuasive and willing to correct with patience 2 Timothy 3:2