You don't necessarily have to start a new return to add a Schedule C reporting self-employment income. The Schedule C is just an additional form filed with your return. You can go back through the sections where you made a mistake and delete those entries without needing to start over.
Take a look at the following TurboTax help article for some guidance about entering a Schedule C:
Where do I enter Schedule C?
If you decide that you still want to start over, take a look at the following TurboTax help article for instructions:
How do I clear and start over?
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