look at Joomla. it's a great CMS solution... and open source.
I run about 30 different Joomla sites. you can have a blog, forum, image gallery, and most anything you could ever need. it's based on plug in modules... most of which are also open source.
but you will still have to purchase a domain name and a hosting plan.
or you could use the "sandbox" section here on polyloop
