Si nice I've been working as a sub nurse for years, the 1st thing I would do is become knowledgeable of the Covid 19 policy for that particular school. You would evaluate each student's complaints as they come to the office, give appropriate care and send them back to class or if necessary, send home. Document all that you do for each student. Also, on entering you should locate what you may need in an emergency e.g. Epipens, emergency bag needed for an evacuation. Also locate equipment e.g. Thermometer, bandaids , etc. (Each nurses office in the schools are a little bit different)..