If you have a copy of EQ then you can play here for free... Go to the tutorials and howtos section and look for How To Play on EQEMu...
http://www.eqemulator.net/forums/viewtopic.php?t=9649
In other words, EQEMu supplies the server for you to play on (unless you want to set up your own) and you supply the client (read the game iteself)