New York Small Business Development Center helps businesses at all phases of their operation. There are SBDC programs in every state in the US and the District of Columbia, plus Puerto Rico, Guam, and other outlining areas. It is funded as partnership between the US Small Business Administration and the host institution, usually a college or university.
I have been a business librarian for nearly 24 years. I'm one of four professionals who help our New York SBDC business advisers assist the clients who come in to receive professional, free, and confidential advisement.
While the businesses can be at any stage, from expansion to retirement, probably a majority of SBDC clients are entrepreneurs. The Wikipedia defines entrepreneurship as "the process of designing, launching and running a new business, which typically begins as a small business, such as a startup company, offering a product, process or service for sale or hire."
I've only recently learned that the SBDC out of the University of Texas in San Antonio has been involved in helping other countries to ascertain whether to use the model the SBDC program in their lands.
There is a magazine called Entrepreneur, which may be useful for someone starting or expanding an enterprise.