Read the book - How to Win Friends and Influence People
As a coach, you need to be able to Sell - or have somebody sell for you. If you’re a great coach, and nobody knows, you’ll train nobody.
If you’re serious about learning - get as many books and dvd’s from this site, and get either your Strength And Conditioning degree or Exercise Physiology Degree - the later one is great for getting government grants.
Without a proper degree of sorts, then you may not be able to insure yourself - in this day of age, something you’ll need.
Once you have done all that - That is when you’ll start to really Learn. On the job learning.
All the certificate getting etc is just a platform - after which, you’ll learn more in 2yrs on the job than all that Certificate and study did combined. (at least that’s what should happen)