Can I own a game, be boss of it and it belongs to me without owning a studio? So the team members sign a contract that i own it and they are working for money only? I think it would be best to create the studio shortly before game is getting releasable. Or maybe don't need to create studio at all? but would look a bit unprofessionable maybe? What are adv to having a studio?
Yes you can, you still have to register with skatteverket though (Atleast once you start making money)
If you don't register a proper business (and only register with skatteverket) then anyone working for you will have to do the same (they'll effectivly be contractors, not employees) and it really gets kinda messy.
If you plan on having people work for you then you really should register a business to simplify things for your employees. (and get an office, they're pretty darn cheap unless you want to have it in stockholm and it is far easier to work effectivly when everyone is at the same location)