WWII hanger scene. Wow could you pick something more ambitious? For a first project this may be too much. How about the plane in front of the hanger then you only have to build a false front. Looking at historical aviation books should give you an idea of what the hanger would look like.
Next you need to pick the medium. Will it be a wooden structure? Metal? Each has its building difficulties. For a metal structure use Plastic-struct architectural shapes for the frame and model railroad corrigated sheet for the siding. For wood use can use balsa, bass woods.
Plan well pilgrim and you should be OK.