I love maps, especially when they are connected to the spread of the gospel around the globe. One of my favorite websites to visit is worldmap.org. This site, which is part of the World Missions Atlas Project, contains a great deal of resources, statistics, and maps.
Part of the problem in the Western church when it comes to missions is not knowing where to begin. The task seems so incredibly vast. Clearly, only God can do it. However, He has called upon us to be involved (Matthew 28:18-20, Mark 16:15, Acts 1:8). My suggestion to local churches is to research various parts of the world, pray about it, and then get involved where the Holy Spirit leads.
Why not begin where the need is largest? If you look on the main page of the worldmap website, you will see an interactive globe with faces surrounding it from various parts of the world. Run your mouse arrow over the different faces to see statistics for the different regions of the world. You'll quickly notice that East Asia (which is basically code-speak for China) and South Asia (dominated by India) have by far the most people in the world. However, while East Asia has "only" 400 unreached people groups, South Asia has 1100 that have never been reached.
So if you want to be involved in international missions, but do not know what to do, let me suggest that you begin by praying for South Asia. Second, please give financially to international missions. Your denomination, if you are part of one, should be able to help with this. Third, consider making a short-term trip overseas to assist and encourage missionaries who are already there. Finally, consider being a full-time missionary. I can think of about 1100 people groups in South Asia who need you right now.
One additional way to spur your church's interest in international missions is to put some maps up around your building. You can order various maps at the worldmap site. The map below shows the status of evangelization (or lack thereof) in South Asia. It is difficult to see, but any red area has almost no Christian witness (click directly on the map for a close-up view).