M.G.
I recently started blogging just because I'm in the process of publishing a book, and publishers want to see that there's an interest in what I'm saying. I've heard blogspot is very user friendly. I use wordpress, and I've heard it's a little harder. Also, you can absolutely remain anonymous. It's completely up to you. You can even set it up to where only those you invite can see it.
Good luck to you! Feel free to check mine out www.MistyGatlin.wordpress.com It's geared toward teens and young women. Have fun with it. :)