How to pay Class1 NIC when working for overseas employer

I work remotely in UK for overseas employer I have been told I need to pay Class1 NIC on this employment I have also been told I only need to start paying this after 52 weeks Could you please advise if my understanding above is correct, and how I should report and pay these NIC contributions?

Hi BB-54,
You will need to write to HMRC to request a liability decision.
The address to write to is:
PT Operations North East England
International Caseworker
HM Revenue and Customs
BX9 1AN
Please provide the following information:
•    Your full name
•    Your National Insurance number
•    Your date of birth
•    The date you left the UK – if applicable
•    Your most recent UK address
•    Your address abroad – if applicable
•    The type of work you do
•    Your company name and address – UK and abroad
•    Where your contract is held
•    How often you work in the UK
•    Your normal working pattern (the days, weeks or months you regularly work)
Thank you.