You need some old antanov heap of ****e then, with Russian pilot to fly it. Don't worry about the maintence those russian heaps don't need any and the pilot will look after the rest.
With your level of legality so far don't worry about work permits or any of that nonsense it will be fine.
If though your wanting to do it legally you looking at least a million start up costs if going solo. And half that if you can tag onto someones elses air operator certificate. The actual cost of the aircraft will be about 1000 euro's an hour but you will need another 500 euro's an hour for all the legal stuff