TIP:
In addition to the info I left above, if it was me, I'd want to prepare the 2018 return first. Then one can transfer the 2018 data file into a 2019 return.
And if you plan to efile the 2019 return, it will ask you for the "2018 AGI" when efiling. Since you didn't file a 2018 return last year, to verify the 2019 efile you would enter a 2018 AGI of 0 even if you prepare the 2018 return now before the 2019 return.
