Guild, not clan :) You\'re also going to have to specify what type of guild you\'re interested in, and you\'re going to have to actively search. Start in the Guild Forum, and take notice of how things are handled - this is a roleplaying game first and foremost, so you will most definitely need to have a roleplaying character (with a personality, some sort of history, etc.). Doesn\'t mean you can\'t come in with nothing, but you have to be willing to learn, and to adjust.
It may be a good idea for you to explore the game a bit more on your own before joining a guild, since after a few weeks you\'ll have a pretty clear idea on whether you\'re going to stick around or not - and guilds like dedicated members.
Beyond that, welcome to PlaneShift :)