Wordpress is very easy to use and free. You do need to have a server space to host your blog - I use gator for my server. I believe this might be all free under the google blog site.
good luck in getting started - it is very therapeutic and a good way to share your experiences.
Blogger (from Google) and wordpress are probably the most common for folks who want something they don't have to do too much techy stuff with. They're free for the purposes you're talking about, and both easy to set up.
Hi JS- Welcome to the best MS forum in CyberSpace!
I don't have a blog, but have you looked at blogger.com? You can practice here by telling us a bit about you and MS :-)
Kyle