I'd invite you to mine, but it is full at the moment. Haven't had time to kick the slackers in a few weeks.
I'd recommend looking at the guild list (upper left corner), and try joining a few guilds that are 50+ members that are ranked between 25 and 50, with auto-join enabled (so you can join without an invite). Join, look at the threads available and how active they are, look at their marketplace, maybe ask a couple of questions. Don't be afraid to leave your current guild (button found to the right of your name in the guild tab under "membership".
You should be able to find a good active guild that is suitable for beginners somewhere in that group, if not, expand out a bit. There is no penalty for joining, quitting, then joining another guild until you find one you like (except not being able to rejoin one you leave for a week).
Try to find one with fairly low GE requirements that opens all 4 levels of GE every week. To me this is one of the best indicators of a guild's activity. Try to find one with an active Sticks to Bricks thread. Try to find one that doesn't have too strict of expectations. That group of guilds should likely fill the bill as well.