create add on for web site

we have a website in joomla, we need i special pages that will be protected by password and username we want to have i database of our custumer that we can acces securly by the web. the data base will have name,adresse,phone number,employer adresse ref number and more bobes more than 5 people will have acces to this database they will be able to create and modified the customer information neeed shearch box for find faster the customer so first pages exemple : [login to view URL] a page whit login user and password second pages : the customer pages list whit the search box and the list of the first customer class alphabetic when you click on the costumer it willhave i box open whit the customer info that can be change live see picture 1,2,3 for an exemple of what we need for exemple only