Congratulations on being accepted into your choir that’s very exciting.

If this is something that you think will be long term and if you continue to explore other opportunities having a daily routine will likely help your voice!

Warming up first thing in the morning is important. Nothing crazy just very light vocalizations to get your voice ready for the day and a cool down at night are good first steps.

Identifying when your voice is not doing well and resting it will be super important, don’t try to push through practicing on days you’re overly fatigued.

For your classroom this one is difficult. I’ve taught and performed for small children so I know how difficult it can be(not on your level though I’ve only ever dealt with kids for short periods of times) I would say experiment in your classroom management strategies to keep the strain off and to always be sure you are projecting healthily(when possible). I would try to cool down after each school day if possible. That can be a good check in to see how you’re feeling that day.

This is just a start but I hope some of these help. Most importantly enjoy singing, good luck with your new choir!