Thanks for asking a question on thisisyourbible.com
The first "Evangelists" - a word which means essentially "bringers of God's Good News" - were the Old Testament prophets. Noah is called a "preacher of righteousness" [see 2 Peter 2:5]. See the gospels and the book of Acts of the Apostles for a record of the early Christian "Evangelists" including Jesus and the Apostles.
I hope you have found this helpful.