Need to rank a website very quickly

Hello,

I need to rank a web site very quickly, in a certain country and language, targeting a keyword with 5.000.000 competition.

I want to denounce an injustice.

So, I don't mind to make a blog or website, use only html and css or a blog, selh hosted or not, joomla, wordpress, drupal, blogger, wordpress.com...

I know I need to write a text very focused to the keyword.

The point is... what do you recommend me in order to do this?

Your help is really appreciated in advance.