Short term rental - deductions amortization - bought home in November 2020 - available for use January 2021

Hi!  I have a simple question (I think!).  I bought my short term rental home in November 2020 and it was available for use in January 2021.  When do I start depreciation of the rental home?  Can I take the start-up costs in 2020 or 2021?  If you could also point me to the publication - that would be amazing!  Thank you so much!