Easiest way and least likely to get an IRS letter is to simply use the Sch C ... enter the total sales as income and the same amount as an expense to zero out the form.
If you qualify you can use one of the 8 IRS FREE FILE options that will be available mid January ... (for 2020 your AGI had to be $72K or less) they have not posted the 2021 income limits yet ... https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free
