You will need to fill out Form SS-4, the application for employer identification number. File the Certificate of Formation.Create an Operating Agreement; Obtain an EIN; Comply with Local Regulations. 1. The following information has been developed to answer your questions regarding formation of an LLC and to assist in the filing of the Articles of Organization. You can write your own agreement, or fill out our attorney-drafted template to generate your manager-managed LLC operating agreement for free. If you don't have an operating agreement, New York law will dictate the rules applicable to your LLC. What are these rules? Anyone who will operate a business in Suffolk County under a name, other than his or her own, must file a Business Certificate with the County Clerk's Office. Management provisions in the LLC Operating Agreement deal with the management of the LLC business, which basically means decisionmaking for the LLC business. This template is for single-member LLCs.