Hi @Mizzayizza !
You will enter your expenses related to producing your business income under the "Wages and Income" section when you enter the self-employment income. After entering the income, you will be prompted to enter any expenses. Be sure not to forget any!
Here is a great resourse for self-employment information:
https://turbotax.intuit.com/personal-taxes/self-employment-taxes/
Hope this helps!
Cindy