[pan]

OK, first step would be to put the band and singer on in-ears to cut down on stage bleed.

Now choose a microphone that compliments the artists voice and manage to get a good monitormix.

Get a digital console to recall different setups and song-settings.

Make the talent sound good with as little FX as possible. A delay and simple reverb should get you there.

If you are not satisfied yet, experiment with different gear like preamps and compressors.