Church planting among the least-reached people groups of the world is a priority. Very few workers sent to do that ministry have had guided or curated exposure that equips them to do it. You want to be one of those few. Begin your cross-cultural training HERE, before your feet hit the ground "over THERE."  Do the work to discover ways to understand culture, particularly your target culture. Get connected with church planting, even as a short-term volunteer or intern. Learn all you can about the process, the team dynamics, and the ups and downs of church planting. Though it takes time and effort, you will deeply appreciate what you learn through the process when you get sent over THERE.