As a tech turned business owner 27 years ago, I would suggest changing the training order. The first training I would recommend would be taking business classes. I spent far too many years floundering around, behind in my taxes, late paying my vendors, shorting my family.
About 13-14 years ago I came to the realization my business hadn't taken me to where I had envisioned, nor would it without changes. I went to a homebuilder/remodeling show and attended all the business seminars I could. I read several books on managing a business. In short, I gathered a lot of information on managing a successful business over the course of more than a year.
Fast forward to today. My taxes are all current. I get discounts from vendors for prompt payment. My vans look very good with professional vinyl. I had enough in the bank to pay cash for the last one van including all the vinyl, shelving, etc.
The change didn't come from being a better technician. It came from learning how to calculate my break even point, how to charge what we needed to charge to stay in business and make a profit and how to get new clients and keep them with us all while making more money.
I highly recommend anyone considering starting a business, any business, to get business training first. There's a reason why 95 percent of all small businesses fail in the first five years, and it’s usually not because the owner is a lousy technician.