I forgot to say. I have an 18-55 lens and a 70-300 lens. Both Nikon

My husband and I are going to 50th anniversary of Mercury Cougar car show. I bought him a Nikon D5300. He used a Nikon D40 in the past, but his expertise in in the actual rebuilding of the cars not photographing them!
Any suggestions on setting for exterior shots? Interior, engine shots? Underneath car shots? Show is indoors, I think, but most shows are in parking lots. Any suggestions would be very appreciated.