Get to Know Missionaries
Do you know any missionaries yet? If you do, you will find they are a wealth of information about what your future may look like on the mission field.
If you haven't met any missionaries yet, find out what missionaries your church supports. Do they have a newsletter you could sign up to receive? Do they have a blog or have a website? Are they on social media sites? Most missionaries would welcome questions about life as a missionary, so shoot them an email and ask them.
Find out what their prayer needs are. Commit to praying for them regularly, and support them financially as you are able. You might even send a care package if it is appropriate.