Do everything yourself for awhile. You'll become familiar with processes and their problems and get a firm grasp of what a given job is actually worth. Be sure to check with a lawyer. Acting as a module of any already existing business may provide the same protection. Places to check for information are City Hall, the county courthouse, state licensing agencies, the Federal Building, and the nearest Small Business Administration.
Some businesses require special equipment which is used only occasionally.
You may be able to rent time on that machinery. They may be stuck with an employment contract that binds even when there is no work to do. You may be able to use that help at a fraction of its real cost - and value to you. If you know of these situations, ask about them. You'll be doing a favor for yourself, the other business, and the workers who would otherwise be sitting around bored.