So, there are two paths to the kind of lifestyle you want.
Firstly, the conventional 'professional' paths, where you get a high salary in a professional services firm or institution, eg law, accounting/finance, medicine, maybe specialist parts of academia.
If you are more creatively/people-oriented, perhaps the marketing/sales/design/communications route is more up your alley. This way you can definitely achieve your minimum salary, but unless you are a real star performer who gets a lot of bonuses or makes partner, or are prepared to keep studying towards a lucrative specialisation, you will probably never go much over $200-300K.
Secondly, entrepreneurship. Fundamentally what you are doing here is creating very specific value that particular people are prepared to pay you for. It's not unusual that you don't really know where to start, as learning how markets work and where the gaps are is the basis of entrepreneurship, and that's actually something that usually takes a lot of practice and insight.
Some people have a very strong sense of what they want to do in life and a knack for understanding what other people will pay money for, but most people study an MBA or property development or tech or some other commercially-oriented specialisation to learn how to do this, or become entrepreneurs after studying law or accounting. You'll need to have a high risk tolerance and the ability to persuade people to buy into your vision in order to invest capital in your ideas.
If the thought of profit/loss spreadsheets and pitch documents to potential investors make you break out in hives, this isn't for you, or at least, not now. Take the more conventional route with a professional services career. You can always become an entrepreneur later. The media focuses on stories about young, sexy entrepreneurs but most people who have a successful business are actually older, more experienced, and based in unsexy industries like commodity manufacturing or trade-based businesses.
The most important aspect of successful entrepreneurship is understanding the scale at which you want to operate. It is quite possible (though not easy) to build a business that will give you the kind of income you want as a sole trader. What you need to figure out is EXACTLY how much money you want to take home because that will really affect the kind of business you want to set up. If you want to use your own unique skill base to build a company on (like your artistic ability or ability to deliver a specialist service - which could include midwifery, if you decide to target an extremely wealthy market), you could make up to about $1M a year without employing anyone else, or just with a couple of employees. But anything more than that and you will need to think about building a company in a completely different way.