What should I do with a foreign spouse who lives overseas without a SSN ?

I got married "overseas" in 2024 and my spouse is a foreign national and does not have a SSN. My foreign spouse lives overseas and is not a green card holder or US citizen and does not have any financial ties to the US: No incomes, no debts, no assets, no liabilities, nothing in the US.

 

For my tax filing for 2024 :

1. Should I file as "single" or "married filing separately" ?

2. In general, what's the difference between filing as "single" or "married filing separately", such as deductions, credits, and other critical important details ?

3. Can I wait until my foreign spouse moves to the US permanently before filing as "married filing separately" or "married filing jointly" ? My foreign spouse may not move to the US permanently in 2024 or even 2025.

 

Thanks !