Our e-commerce templates guide you through each step of your journey. Choose a template, and create and download your document easily!Stepbystep guide on how to write contracts for leases, business partnerships, and employment contracts. This article lays out an overview of the important factors of drafting an ecommerce vendor agreement. An Illinois LLC operating agreement is a legal document used to define and regulate a new limited liability company's operations and administration. Please put "ESA" and the enrollment NPI or Tax ID number in the subject line of that email. An email will be generated and sent once the ESA has been processed. Each LLC must have an address for a principal place of business, which may or may not be in Illinois. LLCs must keep certain records at the principal place of. Illinois Compiled Statutes Table of Contents.