Most of the harder answers that aren't in the manual - such as how to change your logo - can be found with a search at vbulletin.com. Not here - this site is really just for modifications, which you shouldn't do until you're more comfortable with the basic setup.
I've never found a test site to be necessary, but if you do there's some things you should know about setting it up:
http://www.vbulletin.com/forum/conte...ng-A-Test-Site