When you use TurboTax, the 1040 Form will be automatically generated for you as you progress through the navigation steps to complete your 2018 tax return. You'll have an opportunity to preview your return, including your 1040 Form before filing. More info can be found here:
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing