/list Lists all current irc channels, number
of users, and topic.
/names Shows the nicknames of all users on
each channel.
/join <channel> Join the named channel. All
non-commands you type will now go to
everyone on that channel.
/msg <nick> Sends a private message to the
specified person. Only the specified
nickname will see this message.
/nick Change your nickname
/quit Exits irc.
/help <topic> Gets help on all IRCII commands.
/who <channel> Shows who is on a given channel,
including nickname, user name and
host, and realname.
/whois <nick> Shows the "true" indentity of someone.
These commands should get you started on irc. Use the /help command to find out more about things on irc, or ask someone, most would be happy to help you out.