I was wondering what are the costs to web hosting, now I know it depends on how much activity you expect on the site, because if you don't have a high processor (think that's the term) the site will crash, so to have high hits means you need a higher processor. Where could I find out information like this?

Also, how can I see if a domain name is taken, if it says Error 404, does that automatically mean that no one has the rights to the name? Or could it mean, there's just no site there?