I know nothing about the folk who run Sandoft, but renting space at Donny is no different from basing at any other airport.
The leases on property owned by Robin Hood will almost certainly require a credit check, planning approval from the local authority where necessary, approval from the site owner for the type of business you want to run (to avoid a conflict of interest), a fairly hefty deposit (usually 3 months rent) and quarterly rent in advance.
Then all you have to do is make a living out of it...