The final instructions Jesus gave to all believers after His resurrection. This is the the foundation of missionaries and evangelist also.
Jesus said, "Follow me and I will make you fishers of men" Sharing the Gospel (Good News) with the lost. Several references are in the Bible. https://www.youtube.com/watch?v=W1jmqVU4RDo
Faith comes by hearing the Word of God. Share the scriptures with the lost. Gospel tracts are great for planting seeds.
Most lost people have heard some scriptures in their lives. Maybe from a friend at work or grandparent. "I have planted, Apollos watered; but God gave the increase."
Then saith he unto his disciples, "The harvest truly is plenteous, but the labourers are few. Pray therefore the Lord of the harvest, that he will send forth labourers into his harvest."