NIE / Residecia Question
In 2007 I applied for our NIE Numbers/Cert. The move back then was called off due to the financial crash and family illness. We still have those NIE and already been told by banks and immobilier they are for life. We now are moving over later this year as I will be retired and my wife will retire next March. My question is, will I have to apply for " residencia " and what will we need further to obtain that ? ie what do you have to have apart from the NIE and Passport to show or prove. The different info on line is conflicting and confusing. Thanks