Choose Initial Director(s). You must choose a minimum of one director to oversee your corporation until at least the first shareholder meeting.You'll need to register your business with the state, prepare internal corporate documents, appoint company directors, and issue stock. The first step to beginning a corporation is filing your articles of incorporation. Do this with the Illinois Secretary of State. Starting an LLC in Illinois involves several key steps, from choosing a unique name to obtaining necessary identification numbers. To form a corporation in Illinois, one of the first legal steps you need to take is filing articles pertaining to incorporating in Illinois. This guide will help you file formation documents, get tax identification numbers, and set up your company records. Be located in Illinois; AND. • Have a street or road address or rural route and box number (PO Box num- bers alone will not be accepted); AND.