You should let visitors know who owns the site, the copyright, all those things. I spend a lot of time talking about the pros and cons of putting information such as last update on a page because that's a two-edged sword. If your last update was three months ago, in some cases, that's not going to be very good. But if you're an organization that doesn't change very often, three months is a pretty recent update. You have to consider the pros and cons of everything you put on the page.
Most people usually start by figuring out what it's going to cost to maintain their site.
From page one of the book through the end, I say don't do it that way. Ask yourself what you can afford to do to maintain this site. Set out what you can afford to do by way of maintenance and then design the site around it. You have to maintain the site because these things don't take care of themselves. You have to check your links, check for all the things that could go wrong with the site, especially sites that are modified over time.