Configuring MediaWiki 1.11.0

HalfBloodPrince

(Sorry if this in the wrong place)

I've just recently uploaded and installed a new wiki using MediaWiki 1.11.0 software, and this question may seem stupid beyond proportion, but...how do I start configuring it? Like the skin, layout, imageset, etc...?

Thanks

rvec

http://www.siteground.com/tutorials/mediawiki/
http://www.mediawiki.org/wiki/Sysadmin_hub
that explains most