This introduction to IRC is not mine. A friend of mine wrote it for another forum, but its pretty concise so ill copy/paste it here:
mIRC is a chatting software which can be used for file sharing. Sounds simple? Yes, but a lot of people are afraid of using mIRC and some say that it has mystical powers which it uses to bewitch your hard drive to rise against you, the user. But dont be fooled: mIRC is your friend...
In this tutorial, first let's see the basic mechanism so that you can actually understand what's going on. Here we go...
How it works
The process is simple.
1) You connect to a SERVER using a NICKNAME. (Something like connecting to Yahoo with your Yahoo username.)
2) You join a CHANNEL. (Channels are equivalent to Chat rooms on Yahoo)
3) The users on a channel (chat room) are classified into: OPERATORS (Short: Ops), HALF-OPERATORS (Short: Half-Ops), VOICED USERS and REGULARS. (Some servers have extra classifications like Super Ops and the like... but dont worry about it for now).
4) After you're connected, you can TALK by typing out something and pressing your Enter key.
5) You can also DOWNLOAD from people who want to give you stuff. (Now that's what most of you are interested in)
6) The people who want to give you stuff can DCC SEND it to you. This means that they have to select which file you want and send it to you. Now, 93.4% of the world is comprised of lazy bums like you and me... (well, me atleast). So, these people set up a thing called FILE SERVER. These file servers are like an automatic answering machine which will send what files you want. You ACTIVATE a FILE SERVER using a TRIGGER. (Something like CALLING a TELEPHONE using a PHONE NUMBER). Once inside, you can use commands very similar to DOS, like dir and cd (taught later on in the tutorial), to find out what anime the person is serving. If you find something interesting, you type another command asking him to send the file. More on File Serves (Short: FSERVES) later on...
7) Some kind-hearted people set up things called XDCC SERVERS or XDCC BOTS. These bots are located on dedicated servers to send you stuff at very high speeds (depends on your connection though). You can download stuff from them too... We'll learn about them too.
Cool After you download your stuff, and finish everything, it's time to close mIRC. (But of course, that's only if..... you want to...... muhahhahhaa)
And here is the link to the IRC tutorial I made. Its for the upp client, so dont think it would work if you downloaded a different IRC client if you do decide to go on IRC.
http://animestan.7.forumer.com/viewtopic.php?t=780
Most of the stuff up there is when you know what channel to go to, though once you have a client you can go through a list of the servers/networks you want to join and to join you type: /server <server address> and to join a channel you say: /join #channel name
Im sure there is a way to search for channels once your on a server. I've always had specific channels to go to so never really had to search for channels, so dunno how to do that. I'll go find out how to do that and tell you tomorrow if you want