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My fiance is starting his own website soon and it doesnt seem like this wold bring on much money at all. Am I wrong?

I am interested in creating a political website, where I can express my views and create a forum where others can comment and a dialogue can take place. I want it to be more than just a regular blog. I know about google ad sense, which helps you sell space on your site for advertising. Does anyone have any information not only on how to get started, but also good ways to promote the site itself. Thank you