Training. Sending. Serving. Joining Globe

That depends on where and with whom you will serve. If the people are English-speaking you may not need to study a language. But, in every other case, you MUST learn another language. It is the only way you will ever have long term impact. Language skills help you make new friends, especially when they see how hard you are working to learn THEIR LANGUAGE so you can communicate from the heart with them.