Start by checking whether you need a visa and confirming your right to live and work in the UK on GOV.UK. Once you arrive, arrange somewhere to live, apply for a National Insurance number if needed, open a bank account and register with a GP. You may also need to pay council tax, set up utilities and understand your employment rights and tax position. Requirements vary by nationality and circumstances, so check the relevant GOV.UK guidance and seek regulated immigration or financial advice if your situation is complicated.