Missing a few months to 10 years of full NI contributions

Starting from next month I will move abroad, at least for 2 years, considering I have already 9 full years of NI contributions, I would like to get to 10 to access the minimum pension, and potentially if I come back to the UK resume contributions from the 10 years mark. Shall I make voluntary contributions as explained here? https://www.gov.uk/voluntary-national-insurance-contributions How do I determine the amount and when do I do it? Will the Future Pension help me out with those questions here https://www.gov.uk/future-pension-centre Regards, Donato

Hi donato,
Our leaflet Social Security abroad: NI38 explains about paying voluntary National Insurance contributions whilst overseas including how to pay them.  
If, once you have read the NI38 you would like to pay voluntary contributions whilst overseas, please complete and return our CF83 application form.  
The NI38 and CF83 application form are both available via theabove link.
Before paying voluntary contributions you should check with The Pension Service to ensure that it is worthwhile for you to do so.  
The following weblink details how you may contact The Pension Service and check your State Pension:  Check your State Pension forecast
Thank you.