As others have said it depends on what you want. Do you want a large FC where not necesserily everyone knows each other and a lot can get lost in the noise, a tiny one where they do a lot together but might not have someone around or something in between where you can generally grab a person or two at most times to help out and so on.

Also what is your focus... having fun and progressing on your schedule or focusing on raiding after you hit 50 and so on.

Whatever the case I'll put a shameless plug for Children of Light here: we're fun loving helpfull bunch that isn't shy of trying everything in the game. You can drop an application either at our house or through any of our members with the tag CoL. Or you can /tell me when on.