Do you mean single crew? If so I'm guessing anything big enough to carry the number of pax you seem to imply will be a two crew aeroplane, J31 etc.
Instead of going ahead and buying and operating the aeroplane you would probably do better getting someone else to the the hard work for you. EG TAG, GAMA, or Air Atlantique. You buy, lease or whatever, they supply crew, operate the aeroplane etc.
Setting up your own operation can be quite a headache. These operators have size and bags of experience to make it all an easy task.
Edited to add: even if you are used to doing it on smaller aircraft.
