This is a real person, responding to your question.
If you are filing by mail, you need to send your form 1040 with all the schedules.
You will also attach a copy of any tax form that shows tax withheld, such as forms W-2 or 1099.
Follow this link for the IRS mailing address:
https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment
If you are trying to file a different form, let me know in a comment. I will get you those instructions as well.
