If it is a horse nail, the front cover should be opposite to the back cover (page 1 to page 80) (page 2 to page 79 \ etc ...).
If it is glued, put the cover on the back cover, and the rest can be scattered, but the thickness of the book should be considered between the cover and the back cover.
Wire packing and plastic packing are basically the same.
If you still don't understand, add me Q 136 666 936.