You will need to file as a full year resident if you were considered a US tax resident in 2018.
You will file as self-employed for the first 3 months of 2019. You can use the self-employed edition of TurboTax. You will enter the income your earned for the 3 months and then claim any business expenses to help offset the business income. If you have no business expenses to claim you can use the Deluxe version.
You will also have to pay self-employment taxes on this income.
If you paid any taxes on China on this income, you can claim a foreign tax credit to help offset double taxation on this income. This is only to help offset income tax not self-employment tax.
On your 2018 US resident return, you should also have included your US self-employment income.
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