As far as creating new websites with content, do you think it's worth registering a domain name and having a real website, or would a free BLOG do just as well, I mean both could have the same content and adsense ads. And even a blog at say 'blogspot' would could have good url, and the blog(s) are free
I would always do it on my own domain, especially if you want regular content in the future as well. A domain name will be strengthened thru a good blog. It can seriously help the rest of your site rank if a good blog is a part of it. Mike