To obtain a sufficient understanding of those issues I recommend a 2-year distance learning course for the Membership exams of the Institute of Logistics & Transport, while working for nothing in the offices of a good charter company to learn the basics of the charter business.
You are presumably hoping to be the Accountable Manager of an AOC-holding company; you must demonstrate that you have the knowledge, experience and skills needed to carry out that job. To say nothing of having total authority to run the finances of the company, together with the finance to run.
It used to be that an airline pilot with a big pay-off could set up a little company, buy a Navajo, and lose all his money in a year, often because while he was flying the aircraft (no actual pay, of course, for doing that), Tracey in the office was filing her nails and screwing the business up.
Those days are gone, I understand.
But, good luck anyway from this old curmudgeon!