This document is sometimes referred to as the charter. This guide will help you file formation documents, get tax identification numbers, and set up your company records.File an annual report for a Corporation, Not-for-Profit, or Limited Liability Company online. Incorporate a business or terminate an LLC. 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. There are several ways to organize businesses in Illinois. The Secretary of State's website provides a fill-in-the-blank form for the articles of incorporation. Association that is unincorporated or organized as a limited liability company.