I found some very simple, very focused instructions at this link:
http://mediakey.dk/~cc/howto-create-your-own-debian-or-ubuntu-package-repository/
Next step: Add a GPG key.
My Own Aptitiude Repos
I now have several machines running Ubuntu and Debian on my home network. Each one had an inconsistent version of the packages on it, and I finally decided this morning I was done upgrading each machine individually and downloading updates when I got around to it. Mikey’s got his own repo now and Mikey likes it.