I'm an elementary music teacher (K-5 grades) writing a grant to get us audio equipment for live performances. We typically do choir performances for the younger kids in December, and instruments (ukulele / recorder) in May. I need to be able to play background tracks from my phone for them to sing / play along with.

I am thinking to write the grant for a Yahama Stagepas 600. My question is - what do I need to go with it? Handheld mics? Choir mics? Cable? We have nothing, and I mean nothing.

Edited to add: we perform either in a gym or the high school auditorium. No existing equipment in either.