Ho Chi Ng

Hi, I arrived in UK on 8 Oct 2022 and I have been working as an individual freelancer for my oversea clients. Few questions I want to clarify before I file my tax return: - I asked HMRC on phone before and they said for my case I don't have to submit a Self Assessment for 2022-2023, so how come I have to file a tax return? - If I still need to file a tax return, in the forms shall I enter the amount of incomes and expenses that I have after I arrived UK? - All of my income are in foreign curreny, how shall I convert them to GBP in the form? Thank you!