No, you do not need a DBA.
You report your income and expenses for the self-employment using your Social Security number on the IRS Schedule C. The Schedule C is included with and part of your federal tax return, Form 1040.
Go to this IRS website for self-employment information - https://www.irs.gov/businesses/small-businesses-self-employed/self-employed-individuals-tax-center
And see this TurboTax article - https://turbotax.intuit.com/tax-tips/self-employment-taxes/self-employed-less-than-a-year-how-to-do-...
