what does "dpkg-buildpackage -rfakeroot -d -us -uc -S failed" mean?

The message is just saying that dpkg-buildpackage command failed. If you read the messages you will notice where's the problem right away:

dpkg-source: error: syntax error in hithere-1.0/debian/control at line 15:
block lacks the 'Package' field
dpkg-buildpackage: error: dpkg-source --before-build hithere-1.0 gave error exit status 255

If you fix that (and maybe other problems it has, that could show up later) it should work.