Of help in this area are numerous aircraft magazines and books which have photos showing various types of activity involving aircraft. The photos don't necessarily have to include the specific airplane you are modeling, but they may provide an interesting setting for your model. Of special interest are crashed airplanes and ground maintenance shots showing technicians at work, with related ground vehicles and equipment. This overall view of our diorama depicts the relatively-featureless ground that was found on many of Britain's airfields. It is obvious that the underside of the fuselage and wing deeply furrowed the grass verges adjoining the taxiway.
Imagination is the key ingredient in any diorama.
On the other hand, don't try anything too elaborate, especially at first. Find out what your limitations are, then work within them. After you've decided what you want to do, the next step is take the plane, figures and any equipment you've made or collected and plan what space you will need. As much of the model as possible should be put together as will be convenient for painting. Torn or bent parts of a damaged or crashed airplane, as well as shell or bullet holes should be made before the pieces are assembled.