Language school
When I was learning to be a missionary in Japan, I went to language school. Five mornings a week, we got together in small classes with only about eight students in each classroom, because the emphasis was on oral language learning and drills. There, we met missionaries from other traditions as well as students in Japan for more secular pursuits.
Eventually we would go to our assignments, either as pastors or as English language teachers. But at that point our main responsibility was to learn the language, at least enough to get started at communication and relationships. Our language classes did not give us the ability (for example) to understand or speak in religious terms, but we learned to ask questions and understand the answers, and we learned some basic sentence structure and vocabulary. After six months were were launch into our prospective vocations, where we would (presumably) continue to learn Japanese at the same time we were sharing the gospel.
I think language school is a good idea. I sort of wish I had language school right now.