I went from teaching band to teaching orchestra, and I have taught some choir here and there in between. Vocalists just play a different instrument than band kids do. You donít have to be a master of their instrument. Teach them to count, sight-sing scales with solfege and work your way up from unisons to two, three or four parts. Have fun and try your best. Enjoy making music with them.
Also, practice piano and learn to warm them up effectively.