My Tenerife survival guide for new and wannabe expats

Thankyou will keep all this in my mind :)

Hi,
Looking for some advise please. We are looking to semi retire to Tenerife and hope to buy a small property and divide our time between Tenerife an the uk. Do we need to register for tax/NI, or anything like that? We will not have our state pension yet for a few years but do not intend to work in Tenerife
. All advice will be gratefully received, thank you.

Thank you very useful , information
:)