US and UK Income within Same Tax Year

Hello, I’d appreciate some advice please as I’m trying to figure out how to file my taxes for 2024. I am a dual citizen with the US and the UK.

I have US earned income while living and working in full time employment in the US during January and February 2024. In March 2024, I left the US to move back to the UK due to pregnancy (I have owned a property in the UK since 2022). I have not been in full time employment for the rest of 2024 but receive a government payment of a care allowance for care needs for an individual, paid by the UK government at a small amount of £350 a month. 

1) For 2024, would I be correct to file with my residence address abroad since that’s where I was the majority of 2024? 
2) Do I need to report the care allowance income on my US tax form or is the amount too small? Where would I report this if so? 
3) Since I have income for Jan & Feb 2024 working in the US, don’t I need to file a State return as well? 
4) What forms do I need to complete my US 2024 tax return? [I have one employment role, one 401k which rolled into a traditional IRA, a HSA account, a HYSA, and two bank accounts] 

5) What do I need to report from the UK side of things? [No current employment other than the care allowance, a few bank accounts (two earning interest), no UK investments (didn’t want to complicate things)]

 

Thank you in advance.