Firstly, I am a consultant not a coach, which means that I work very differently. I have built my own sucessful businesses from the ground up and have over 15 years experience in building, improving and growing small businesses. I have also been burnt a few times over the years myself so I can completely understand why that would be an area of concern.
All I can say is that you need to ensure that anyone you bring into your business has got be someone you can work with, they should have the relevant business experience and be able to back up their advice with a proven track record of owning and running a successful business. Be sure to take some time and research their background thoroughly before deciding to work with them.