Our workers need the support of their church, and that includes you!
Does your church have a missions committee? If it does, ask them for information on our workers. Better yet, join it and help your congregation keep up to date. If it doesn't, how about starting one with the help of your minister/elders and other interested people in your congregation?
Ask the workers you are interested in to send you their newsletters so you can pray intelligently for them on a regular basis... It will be a great encouragement to them.