After you file

I recently e-filed my 2020 return and then received another    W-2.  I had received an e-mail and a text that my Federal taxes had been accepted on February 10th (2021) by the IRS.   As I understand it from what I have read, I just need to wait until I get my refund and then amend both my Federal and State and mail them in.  Yes?

I revised my Federal and State in TurboTax but have not done anything with them. What form(s) do I need to amend my Federal Tax?  (I know what form I need for my State).

Thank you.