Public documents must be notarized because it is of public interest although it may not affect all individuals. The public must have a constructive notice of it.
Birth certificate, marriage certificate (if applicable), any previous passport issued, photograghs (signed for 1st issue) and the application form signed by an authorised person (UK). Also attend...
You must file Articles of Incorporation (also may be called Certificate of Incorporation or similar terms) with the Secretary of State in the state where you wish to incorporate.