I have had so many people asking me on how to start up a blog and I was seriously considering creating a video tutorial until I realised that there were so many good ones out there on the net. There is no point in reinventing the wheel.
For beginners I recommend starting a blog on Blogger, said to be the most popular blogging platform in the World (I actually have no way to confirm this claim). For your information, Blogger is part of the Google family.
Anyway, here is a short but extremely informative tutorial on setting up a blog on Blogger (hosted on YouTube).