Your questions are (IMO) too broad and wide-ranging to be able to answer. It's a bit like saying "I want to open a hotel and restaurant; what do I need to know?" To which the only answer can be "Everything!"
I just don't know where to start.
There are people out there - and this forum is heaving with them! - that think that if you open some species of physical facility, people will be so kind as to line up at the door, waving their cheque books and/or credit cards.
Be it a restaurant, recording studio or rabbit farm, acquiring the physical facility, complete with equipment is the very easiest part of the whole enterprise. Non-business people think that having the money to buy the land/building/equipment/whatever is the biggest barrier to entry. That is not true!
The biggest barrier to entry is your knowledge of the industry and the market and the industry's and the market's knowledge of you.
All those outsiders to the movie business that are desperately trying to get traction and a foothold in the business are running about like headless chicken, trying to catch that mysterious animal called 'Funding'. Every city in the UK has some 'bawheid' trying to start a film studio and they all say "But I can't get the funding!" and expect the hard-pressed tax-payer or some movie mogul to realise their dreams for them.
Yer, right!
The same madness applies to all and every physical facility to a greater or lesser extent. Hardly a day goes past, without somebody wanting to open a recording or video studio. A couple of years later, they fold in private disaster, often taking the houses and savings of their former owners with them.
Now look at what you are trying to do dispassionately - why do you think you are the right person to start a bus-hire company?
Supposing you had a million pounds to start a small bus company (trust me - one million would be a very small bus company!) would you hire yourself or an experienced fleet manager to run this new beast?
Remember - the bus-for-hire business is wildly over-subscribed. It is what is commonly known as a post-mature market. There was a time, when Ann Gloag and her brother Brian Souter started 'Stagecoach' with one old bus going from Dundee to London, it was the beginning of bus-deregulation. i.e. it was 'Wild West' time, 'Oklahoma land-rush' time!
That was 1980 and it ain't 1980 no more!
If you want to start a business and you are hoping for a 'Stagecoach' future, find your Oklahoma Land Rush now!
Busses it am not!