Well perhaps you have a fortune already, just not the knowledge and experience.
Good on you for being ambitious, nothing ventured, nothing gained and all that - but make sure you do all your research meticulously otherwise you might just as well go to the Casino and put it all either on Black or on Red - you have a greater chance of getting it right!
Use Blink's Business Model as a Case Study from before they started to where they are today - look how many aircraft they intended to start off with and look how many they actually have now. Then ask yourself why this week they were selling empty legs on their Mustangs between the following destinations:
1. Farnborough to Blackbushe - If you work out the Block to Block time, you'll probably find that Mo Farrah could do it quicker on his feet!
2. Blackbushe to Northolt - 18 Minutes or So Flying time
Once you have spotted the obvious mistake that no other Air Taxi Operator has, then click on this link and these guys
Evers Consulting - AOC Application & Manual Writing (Don't know them, just know of them) will tell you exactly what you need to do (for a price)!
Very Good Luck, but please don't just throw money at the CAA until you are absolutely certain you have got it right. The bottom line is that if you can start up a business in a recession and survive, then you'll do just fine!