Hi! So lets start this fastest we can! So first you will need MCEdit (http://www.mcedit.net/) And a schematic
(http://www.planetminecraft.com/project/blocks-pvp-block-not-what-you-think-it-is/). Now we had come to import.
Open MCEdit. Now go to load world. Select your world where you want to import.
Then go to import. (By clicking it). Now opens a window. Find your .schematic file. Then place it where you want it.
After that. Press import.
So easy is it! Good luck! Bye!