GFDL is the usual license used for wikis so just use that.
Basically, all you need is to do is make a page with a declaration of copyright intent like here, and then link to a page with the full license spiel on it, which you can grab a copy of here. I don't think you personally need to write your name on a license anywhere in this case, you just need to state the website name and what license it uses. A disclaimer page similar to this would also be handy. I doubt you'd need any more than that. Hope that helps.
Basically, all you need is to do is make a page with a declaration of copyright intent like here, and then link to a page with the full license spiel on it, which you can grab a copy of here. I don't think you personally need to write your name on a license anywhere in this case, you just need to state the website name and what license it uses. A disclaimer page similar to this would also be handy. I doubt you'd need any more than that. Hope that helps.