There aren't many shoulds or can'ts in this business. It's very flexible, and you can design it to work best for you. We can put you in touch with coaches who do if you want to ask them about it. Not everyone is going to make six figures as a coach, but as they strengthen their skills, more and more coaches are. If you become a coach because you want to and run your practice like a business, you can make a great living at this.
Potential clients are everywhere.
We all know at least 50 people, including vendors, friends, family, colleagues, customers and neighbors. Let all of these people know what you now do and invite them to work with you for a month or two gratis. Finding clients is more of an emotional concern than a practical one. Charge what the client will pay. There is a TeleClass that covers this topic in detail.