You may not have any expenses to enter on a Schedule C since you were a substitute teacher. and would not have been buying classroom supplies, etc. (Did you buy any books to take to school with you to use as read alouds, etc.?)
But since you have self-employment income reported on that 1099Misc you are subject to self-employment tax for Social Security and Medicare. The school did not withhold those and pay the employer's part so you have to pay all of it--15.3% of your earnings.
https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922
https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax
https://ttlc.intuit.com/questions/2893392-where-do-i-enter-a-1099-misc
https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
