Ephesians 4:11   And He gave some...Evangelist

Evangelist are soul winners, that is the mark of their calling. Their main message is the gospel message of Jesus Christ. The office of an Evangelist, has an anointing that draws people.

Romans 1:16    For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.

* The only example we have of an Evangelist at work, is Philip.

Acts 8:5,12    Then Philip went down to the city of Samaria, and preached Christ unto them.
Vs.12    But when they believed Philip preaching the things concerning the kingdom of God, and the name of Jesus Christ, they were baptized, both men and women.

* The people believed and then were baptized. Water baptism, is after a person accepts
  Christ, and never before.

1 Corinthians 1:17   For Christ sent me not to baptize, but to preach the gospel...

Acts 8:35-38   Then Philip opened his mouth, and began at the same scripture, and
preached unto him Jesus.
Vs.36   And as they went on their way, they came unto a certain water: and the eunuch said, See, here is water; what doth hinder me to be baptized?
Vs.37   And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.
Vs.38   And he commanded the chariot to stand still: and they went down both into the water, both Philip and the eunuch; and he baptized him.