Do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
Include any new/corrected tax document (e.g. W-2) only if it shows federal tax withheld, and include in order only those Sequence Numbered tax forms and Schedules that changed or were added due to your amendment.
If you are using TurboTax you have to do this by careful visual comparison. The program won't break out those pages for you.
If all that was changed on the amended tax return was the addition of a W-2, then all you need to file is the signed and dated amended tax return, Form 1040-X, and a copy of the W-2. Nothing else.
You can e-file your federal amended return with TurboTax if your original return was also e-filed in TurboTax.
Do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
Include any new/corrected tax document (e.g. W-2) only if it shows federal tax withheld, and include in order only those Sequence Numbered tax forms and Schedules that changed or were added due to your amendment.
If you are using TurboTax you have to do this by careful visual comparison. The program won't break out those pages for you.