Here is a summary of the steps I took:
1.- Create a directory. I did it in my home folder.
$ mkdir /home/chals/.local_repository/binary
2.- I copied there all my .deb packages
$ cp *.deb /home/chals/.local_repository/binary
3.- I generated the file Packages.gz
$ cd local_repository
$ dpkg-scanpackages binary /dev/null | gzip -9c > binary/Packages.gz
4.- I added the repository to my sources.list (You know the drill, use vim or tee)
deb file:///home/chals/.local_repository/ ./5.- I updated and installed
sudo apt-get update && apt-get install packages