Forum Moderators: open
Forget about PR :: It means NOTHING. As long as you have 5+ it's just not worth chasing IMO.
I can't give you the answers to all of your quesitons. It's not an '1hr science' but I can tell you that all you need is right here. Just trawl through the librarys of the appropriate forums for great theads that'll help.
Good luck!
Nick
Exactly. PR is nothing more than an indicator, not to be taken as a reality check on how good a site may be regarding SEO, hence sites with PR2 pages kick into touch PR5 sites, due to it not being important.
Three words for today. Planning - Development - Analysis (forget about the toolbar).