Your federal return is looking for the income on your tax return. It's not necessary to register a store name for the IRS unless you have employees or plan to create a partnership, s-corporation or other entity besides sole proprietor. The store name you made up is not on the 1099-K for 2024. Report the income as self employment.
Registering the store name you made up and using that is really a legal question for your county.
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