Your love for God and your desire to glorify Him, no matter what, must be top priority. Crossing the ocean will not make you a missionary. Whatever you propose to do in ministry across cultural lines you should already be doing now. It is the church that does the sending. They need to be involved in discipling, training, and equipping you.
Some countries require a degree for entry.
The pressures of cross-cultural ministry require that you be in good physical, emotional, and psychological health. Stamina and good health are important assets. Going out with a mission agency means joining a team. You need to be compatible with the team's beliefs, goals, and methods. Study the agency's doctrinal statement, core values and purpose statement.