If you choose to go the Schedule C route:
Your business name would be your name
Your business address would be your home address
Your accounting method would be cash
Your business start date would be whenever you started teaching or whenever they started doing this supplemental policy.
Although the Schedule C is what the IRS would expect to find since they issued you a 1099-NEC, with this being a new form, it could go either way. With the Schedule C, you will end up paying more tax wise due to paying Self-Employment taxes.
If you choose to file it as other income as I mentioned above, you should keep documentation that this is not for a business and it was simply supplemental pay as a way to retain you as an employee. The documentation could be something like the letter you received stating you would be getting this income.
Although this answer is a few years old, it shows the other way to report your supplemental pay. There is still no black and white answer as to what the IRS expects in situations like yours.
@Ashel56
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