@17594354371 , based purely on your post, your assumptions are correct i.e. you file a form 1040 with a residency start date of "date of arrival". Note that you must use itemized deduction because of "short filing year".
If you had any US sourced/ connected income prior to the residency start date, then you have to also file a form 1040-NR ( not supported by TurboTax) . In such a case you have to declare yourself as "Dual Status Filer" and include this notation on both the 1040-NR and 1040. It is best filing this by mail.
Is there more I can do for you ?
