You don't use a 1040X. The 1040X is for an Amended return to correct an original return you filed. You use a regular 1040 and fill out schedule C for self employment.
You might have to import from the .txf file. Info on Importing Tax Exchange Format (.txf) files, see
https://ttlc.intuit.com/questions/1899278-how-do-i-import-from-the-txf-file
See Note - Neither TurboTax Online nor TurboTax Business supports imports from the .txf file.
