Choral Public Domain Library

Good day, I am a lover of playing the organ and keyboard. I urgently need to learn how to play SATB simultaneously for playing in my church as well as teaching church choirs. I can play cords and the first score Soprano when playing. How do I teach myself to play the other three?

If you can't find a teacher the most helpful thing for the choir would be to start with learning to play bass and chords. Here's an online primer: http://www.musikanalyse.net/tutorials/regola