Hi LaughingJack,
First of all, welcome to Wikia!
Wikia is a collection of fan sites created using Wikia's software. A user can create their own fan site about a specific topic, or join a site already created. You can edit articles similar to how Wikipedia or MediaWiki is setup. If you're looking for a specific Wikia site, use Special:Newwikis to search for it.
If you're absolutely confused on how things work, like wiki-text for example, it's best if you start reading the help articles found here: Help:Contents
If you have more questions that are not covered in the help articles, ask here on these forums or join the chatroom located on the right side.
Cheers!