Start with GOV.UK to check whether you need a visa and to understand the immigration steps that apply to your circumstances. Once you know where you will live, contact the relevant local council about council tax, housing services, electoral registration and local support. You can register with a nearby GP and find NHS guidance through the NHS website. If you will work, contact HMRC about your tax arrangements; if you may need financial support, check eligibility with the Department for Work and Pensions on GOV.UK.