Thanks everyone.

It went quite well. I didn't use the condenser, because of what cassp said. I put the 58s as suggested, and got a decent sound (I think).
I asked a friend to set the levels while I conducted, but apparently he didn't do a great job, because people told me afterwards that the choir wasn't loud enough compared to the music and soloists.

Also, for some reason the kids kept going sharp (tuning), so I had to continuously correct them by playing on the keybaord (the music was pre-recorded). Is this nerves? Maybe they couldn't hear themselves well enough? Or maybe their monitor was too quiet? They sang in tune in the practise sessions.

Despite all this though, I got loads of great feedback, so thanks for the tips.

Zalmi