Or you can join one of the most popular craftmine.com Minetime.com Play.gotpvp.com mc.desiredcraft.net PMC also has a server recruiting chat room under the tab chat.
EDIT: Here's a great introduction message about multiplayer: it's not single player, and it can get pretty brutal when you're pvping. Building without protection, forget about it. Also, be prepared to be bombarded by 10 year olds with power.
Ah, yes. This brings back the first time I made a server. It was a cracked one, to allow every MCer to join. This was before we knew about the lack of security. We built this great spawn and wild spawn, opened it up, and within the first few hours, someone had logged in as an admin and filled everything with lava. Good times.
