Cathy Liska 
Building a business, whether part or full time, is a process. It takes work and a willingness to put yourself out there. There are many types of businesses and each brings unique challenges. When you look at the research, new businesses failure rates range from 50% to 96% (that is a huge difference). Read more on this at http://www.successharbor.com/percentage-businesses-fail-09092015/ and then keep reading to learn how you can be a success – http://www.businessknowhow.com/startup/business-failure.htm and http://www.forbes.com/sites/neilpatel/2015/01/16/90-of-startups-will-fail-heres-what-you-need-to-know-about-the-10/#55faade355e1 are a few articles to get you started.
What does it take to be successful? Of course a product or service that people want, paying attention to what, how, and who, flexing to the market and your opportunities, consistency, follow through, and quality to name a few things.
There are a number of great books and other resources about being an entrepreneur. One I really like is The Little Black Book of Entrepreneurship.
Interesting to note is that many think about being a coach and in fact plan to work independently without connecting this to being an entrepreneur or business owner. Yes, there are jobs for professional coaches; alternatively, working independently is more than learning to coach. When you move into the coaching profession, do so with an awareness of which opportunities interest you and your own willingness to make it happen.
If you want a job coaching, then you will prepare by building your qualifications with coach training, creating a great resume or CV, applying, networking, and interviewing.
If you want to work independently, in addition to coaching certification investigate what it means to be an entrepreneur and business owner.
