Karin’s advice is, as usual, excellent.
I would particularly agree with the point about ‘stealing business’. It is helpful to start on your own, partly as it lets you figure things out in a smaller way, before adding the challenges of working with others. It also lets you develop relationships based on trust and mutual respect. As an employee I always behave with loyalty to those places I choose to teach. Yes, there are those who do not. And having a contract that you draw up with help of your legal counsel is the best way to start. But you will do better at drawing those to you who are honorable if you treat those who choose to work with you with professionalism.
The first two steps are to make sure your own credentials are in order: training, a national certification (one at least), and insurance, and to make sure you have experience in the industry.
The next step is a thorough business plan that matches your start up budget.
Personally I would put staffing issues after these other things, though I guess plenty of people follow other ways of doing things and manage very well.