1. Proffessional:-

NMC

https://ireg.nmc-uk.org/
https://www.nmc.org.uk/registration/joining-the-register/trained-outside-the-eueea/

Disclosure and Barring Service

https://www.gov.uk/government/organisations/disclosure-and-barring-service

2. General:-

https://www.gov.uk/apply-national-insurance-number

Home office for Immigration rules.

https://www.gov.uk/government/organisations/uk-visas-and-immigration