To become a missionary, start by getting involved in your church, since missionary organizations often look for applicants who are dedicated to their faith. You can try volunteering at the next church event or even just getting to know the people in your congregation.
How do I become a missionary at home?
https://www.youtube.com/watch?v=JUNyoEVsKjw
What are missionary activities?
Missions involve sending individuals and groups across boundaries, most commonly geographical boundaries, to carry on evangelism or other activities, such as educational or hospital work. Sometimes individuals are sent and are called missionaries.