I used to sit with a group of friends who are Christians during their weekly care group meeting. Uncle Francis was an evangelist and church pastor after he returned from Kazakhstan. He told me the story how he set on a journey living life as an evangelist, similarly to yours, he prayed and had that idea out of nowhere one day after church service. He kept quiet and dreamt about it that he was serving the poor in Russia. One day, his wife went up to him and asked him "why don't you start embarking your life as an evangelist? The church need to send someone to Kazakhstan". He smiled. He said, the confirmation came when someone else who he did not share anything with, brought it up. He knew that was God speaking to affirm the decision.