I'll start off with saying I think it is in your best interest to go to a good tax professional to do this and to review your tax returns. If you missed claiming depreciation, it is quite possible that there are other errors or problems on your tax returns. In my opinion, the most expensive way to prepare your tax returns is to do it yourself (including using DIY software like TurboTax). A good tax professional will not only prepare your tax returns correctly, they can give you advice.
In answer to your questions:
1) 13 is no.
2) 19a, no.
3) 27, no.
4) 28 is no. It does not apply unless you OWE more tax.
Side note: You weren't allowed to claim ANY depreciation in 2021 on the house if you had not claimed depreciation in 2019 and 2020, and did not file Form 3115 with the 2021 return.
As I said before, it is opinion it is in your best interest to go to a good tax professional. Over your lifetime, using DIY programs like TurboTax very frequently ends up with you paying more tax than any savings in tax preparation fees.
