This free Guide provides links to valuable resources, and outlines the steps for starting and operating a business in the state of Washington. An LLC beginning business in Washington State must file formation documents with the Washington Secretary of State.If you are a sole proprietor or partnership, you must file a Business License Application with the Washington Department of Revenue. Running a business in Washington involves creating an operating plan, managing employees, and ensuring compliance with state requirements. For most small businesses, registering your business is as simple as registering your business name with state and local governments. File your formation document with the Secretary of State. Find out how to start a business in Washington state, whether you need a Limited Liability Company, Corporation, or DBA. Share your videos with friends, family, and the world. Go into detail about the problems your business solves. We are a full-service management company licensed in the District of Columbia.