First of all, within reason!
$2,000,000, €1,500,000, £1,250,000, 150,000,000 cent; call it what you want.
I want to know the name, where you'd fly from and to, what planes you'd fly with, roughly how much you'd charge, whatever business model (LCC, Executive etc...) and where your base would be. These are just guidelines.
Put a livery up if you want.
Personally,
I would call myself: South East Airways/ Southeast
I would set up in: Waterford (WAT), Ireland
I would fly to: London Luton (cargo via SWS) daily and Brest/ Nantes (maybe connecting to Paris)in Summer.
I would use: 2 rented ATR 42s, 1 for passengers and 1 for cargo.
I would charge: €75 to London, €100 to France
I would provide a quality service, free snacks etc.
I would have bases in Waterford and Galway (GWY). Basically, fly GWY-WAT-LTN, picking up the pieces for Aer Arann.
PS. I don't care if you don't like my livery.