During my research I have discovered that as of 2nd of april 2007 I do not need to apply for a residents card because I am an EU member. But have to apply for Certificado de Inscripcion en el Registro Central de Extranjeros? (certificate of registration in the central register of foreigners).  Will I get my NIE number then and, as I am planning on working for myself will I require a resident card at all?  Can anyone clarify this for me please. Thanks