Here are 3 outstanding websites to assist in your prayer life:
1). International Mission Board's CompassionNet - click on "Today's Prayer." For children - they can use Kids on Mission to pray for MKs.
2). Operation World - this is the most exhaustive prayer guide for all nations available - there is a book available I highly recommend.
3). Joshua Project - this website leads prayer for Unreached Peoples of the world - the statistics are outstanding on this site. As I type this, 41.7% of the world lives among unreached people groups - little or no access to the Gospel.
Pray for Somalia - in 1991 there were 150 believers - in 1997 there were 4 - even this missionary's son was killed. Nearly 10 million people live in Somalia. The video below is why your prayers are needed.