While you can use this documentation to build you own channel server, it is possibly easier for you to either get your package into PEAR itself, or setup your own channel server. The reference implementation of a PEAR channel server is the PEAR website itself, but it should not be used for your own server.
If you seek for an easy-to-setup software, try Chiara_PEAR_Server which resides on its own channel http://pear.chiaraquartet.net.
Another project is the SimpleChannelServer in SVN. The project is under development, though.