1. Don't be shy! I see a lot of users who are confused at first, but don't feel comfortable asking questions. Many of the established users are there to help you get along, and have been at the beginning themselves, so they can make sure you don't feel any confusion.
I have frequently looked to other Wikis for ideas. Not necessarily to take in their entirety, but rather to be inspired to make something awesome for my own Wiki. Wikia is such a large community, full of different ideas, almost like our own world with different countries and cultures, so don't be afraid to explore and get influenced!
Ask me about
How do I get involved? If there's but one question, this would be the one to set their Wikia career in motion. I love it when I get a private message asking me "Where do I start?" Getting users off on the right foot is a rewarding experience for myself and them.