If you are a self-employed independent contractor, sole propritor or single member LLC that has not incorporated then you report your self-employment income and expenses on a Schedule C. The Schedule C is not a separate tax return, it is part of and included with your personal tax return, Form 1040.
The 2109 tax return can be filed after January 1, 2020. Although most forms and schedules will not be finalized and available for filing until late January 2020.
If you are using the TurboTax online editions then you will need the Self-Employed edition to report your income and expenses on a Schedule C - https://turbotax.intuit.com/personal-taxes/online/
