Aside from the current autism about not going to the drama section, welcome to the forums. As everyone said, once you join, there's no escape from here. But who would want to leave?
I'll be covering this, since nobody is. See those stickies in every board at the top? Yeah those. Those are important. Failure to follow the stickies and rules are liable to get you banned, don't stuffpost and use the forum emoticons, and overall, don't start stuff, etc. ad nauseum. Look up The Sacred Order of the Harvest for that.
Want Add-ons? Go to the Add-on or Modification Help section.
Want to get or check out sweet building projects, look at the Gallery.
Want to join or start your own clan? Go nuts in the Clan Discussion.
Want to look at the ills of society and weekly gossip, flip your stuff in the Drama section.
So yeah. Have fun, enjoy your stay. Cuz you'll never leave. =]