Dana Shultz, a lawyer in the Bay Area, maintains a great blog on legal topics, and many of his posts cover questions relevant to maintaining the formalities of small businesses. Below are two that discuss questions of issuing new ownership interests, such as shares of stock if you have a corporation and membership interests if you have an LLC. While we recommend consulting a lawyer when bringing in additional capital due to the importance of getting it right, these posts are instructive so that you have a sense for the process.
Issuing corporate shares
Issuing LLC Interests