LOL…. i would start with finance web sites! the number one thing you need is capital! capital! and more capital! good luck!
Honest with ya, you’re going to need more than you can get from a free website. I’d seriously consider hiring or taking on as a partner someone who’s been in that business before.
If you need to ask those questions on here you have no hope of starting any kind of jet charter business. The requirements for the “back office” as you put it are all set out in the regulations that you will need to know back-to front and inside-out! Contact the CAA or regulatory authority for your home base country.
I hope no-one I know ever comes to you for a job!
Cool cool. Good luck.