[Hellcat]

This is what I have in my config:

$wgGroupPermissions['*'    ]['createaccount']   = false;
$wgGroupPermissions['*'    ]['edit']            = false;

$wgGroupPermissions['user' ]['move']            = false;
$wgGroupPermissions['user' ]['read']            = true;
$wgGroupPermissions['user' ]['edit']            = true;
$wgGroupPermissions['user' ]['upload']          = true;

In the inculde directory you find a file "DefaultSettings.php" - you can browse trhough this one, there's a ton of more possible settings.
Everything you want to change, copy it into your localsettings.php and set the options like you need them.