It is legitimate to sell blocks of hours in your B200, as long as it is a "dry lease"; the party buyiing the hours must pay for fuel independently.
Also, there must be a third party arrangement for the crew, ie, the lessor may not provide crew directly.
FlightPartner in Gloucester has made a good business of selling hours on their aircraft and those of aircraft it manages. Contact them and ask to speak to Bob Burns or Calfin Roderick. They are very helpful and will give you all the advice you need.