After you file

The tax form (1040X) has not been finalized in TurboTax yet, which means, you can't file the form right now.   You can check the availability with the tool in this TurboTax FAQ.    It is tentatively scheduled for 02/20, but that could change, see below.  

If you receive tax forms for other types of income, including interest or w-2s, you can prepare one amendment to report any and all income you forgot to include when you originally filed.   

Reasons you would need to amend your tax return, and reasons why you would NOT amend, please see:  Do I need to amend my return?  You have 3 years to file an amended return.