1. The one thing that everybody in this thread agrees on is that just inheriting the house is not taxable.
You should review Publication 559, Survivors, Executors, and Administrators.
2. You should get forms for the portion of the year your father lived. If he passed in 2022, any pension or other income statement will come to the executors (you and your sister) once you have notified the issuers and provided the death certificate. The IRS has a quick How Do I File a Deceased Person program. It is very detailed and may give you additional information.
3. No, you can't do taxes a year ahead.
Enjoy the house and land and I am very sorry for the loss of your father.
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