Buy hosting and install wordpress. Simple.
You would be the first person back here in the forums yelling at the top of your lungs if another blogger brought in some bad code that brought down your blog.
Get hosting and then you can do whatever you want. If you install a bad plugin or code (and there are a lot of them out there) that kills your blog, then you don't bring down everyone else.
Also, watch out for themes. There is an increasing number of themes out there with malware built right into them.