At the beginning of the Inquirer Path, you probably started this inquiry because you have a subjective heart desire or burden or vision for missions; and are wanting to explore how you can be involved.
Along the way in this Inquirer Path, God may be confirming your desires and vision. This desire in the heart or burden or vision talk is highly subjective, so it is important to have more than just a deep desire or zeal or burden or vision for missions.
The way God leads His people is usually by taking more objective small steps along the way. The Lord will usually guide you through the means of walking with the Lord in prayer, reading His Word, the counsel of your local church elders/ pastor/ leaders, and circumstances as you take deeper steps of obedience. This is basic Christian guidance. “In all your ways acknowledge Him, and He will direct your path . . ." (Proverbs 3:5-6).
You would not be reading this if you were not at least curious about it! So, it is important for you to take some objective steps of obedience in the context of your local church with counsel from your elders/leaders/pastor as you grow. God usually guides us further as we take steps of obedience.
Just as a boat or canoe cannot turn to the right or left unless it starts moving, the Lord doesn’t guide people today unless we are walking with Him and obeying Him and reaching out where we are now. For example, you don't suddenly become an overseas missionary in another culture if you have not been witnessing to people in your own culture first.