Leaders in the New Testament were chosen in a variety of ways, by different types of church leaders or by consensus.

1)  When the choice is between two qualified men, the lot is used.   Acts 1:23-26  (See also Proverbs 18:18).

2)  By consensus of the church:   Acts 6:1-7

3) By divine revelation:  Acts 9;   Acts 13:2-3; I Timothy 1:18

4) Appointed by an individual in authority (these cases seem to be churches that weren’t well established yet)   Acts 16:1-3; 2 Timothy 2:1; Titus 1:5; I Corinthians 4:17

5)  By apostle and others choosing together:  Acts 14:23;  Acts 15:22