employment, and through on-the-job training learn about the field of your interest, and start your own business later.
Even physicians and lawyers have wide range of income. They can operate their own businesses or work for employers. Real estate, carpentry, plumbing, painting (obviously not requiring a degree) are similar. You can have your own business, work for business owners as an employee or a contractor (which is actually close to owning your own business). Some large companies, i.e., Comcast, AT&T, often hire a lot of contractors.
Even working as an employee, you can make good money. According to