Brainstorm with children a list of small gifts to enclose in the envelope. Choose one to include with each letter. However, before you initiate such a relationship, make sure your class and the MK both have the commitment to maintain it. MKs are disappointed when a child or group promises to write but quickly loses interest. The reverse may also be true, so check with missionary parents to make sure that a pen-pal program is feasible before launching the idea to your class.
Older children can help address the envelope, weigh it and research the postage cost.
Before the letter is mailed or e-mailed, stop and pray together for your missionary friends. Challenge the children to ask God to use their letter to encourage the missionaries and their family on the very day the message arrives. Caution children not to expect an instant answer, even via e-mail. Missionaries are busy and often struggle to find time to answer their correspondence. Create a scrapbook of your correspondence back and forth with your missionaries to serve as a reminder and as orientation for new class members.