I have a blog on Wordpress.com. I think that's the best site for blogs. I have 135 followers so far since I restarted last year. I had to make a new blog because my old on was flagged as being too "adult". I had a rough couple of years so the f-word was in a lot of my posts. But I couldn't tag any of my posts anymore and it wouldn't show up on any of the feeds. So be careful it is censored.

As for what to write, just write from the heart. What its like to have mental illness, your woes, your good times and poetry. Its all be completely anonymous so no need to worry.