OnlyFans Schedule C Question/Deductions

I am new to Onlyfans and have received my 2021 1099-NEC. The amount shown on the 1099-NEC is my net earnings, not my gross (since Onlyfans charges a 20% fee). Could someone please clarify which "category" (when going through the business expense step-by-step) I would add the 20% fee Onlyfans took, so I can receive credit for it?  Also, would all of the equipment, clothing, etc I purchased fall under the "supply" category?  Thank you in advance for your help.