Take a look at our webinar series -- where you can sign up to interact with Wikia staff, as well as watch past sessions
Be sure to check out Wiki Features to see what features you can enable on your wiki!
Explore our forums on Founder and Admin Central to see what other wiki admins are asking.
Lastly, visit our Help Pages to answer any specific question you may have.
All of the above links are a great place to start exploring Wikia. If you get stuck or have a question you can't find the answer to -- please contact us here. But most importantly, have fun! :)
That can be a tricky one :) The main thing that will bring people to your wiki is good content. Once you have some good pages, then it's more likely that people interested in the topic will find you and (hopefully) join you.
The other key thing is getting the word out to places where others interested in your topic already go. So, for example, you could go to a forum about the American Revolutionary War, and answer questions there with links back to the wiki. Of course, it's important not to spam, but many forums welcome useful links that relate to a question or discussion.
There's more advice on Community Central, and on this help page. But good content is definitely your starting point!
As I said, please use the contect form, and include exactly what problems you are seeing. So not just "I can't log in" or "I can't edit" but "when I click the edit button on http://american-revolutionary-war.wikia.com/wiki/John_II_Ellison I get a message that says "..........." and the edit box doesn't appear" (or whatever you see)