Yes you can..Go to www.blogspot.com..Or www.wordpress.com or just google blogging and you would come across a site.
And then google adsense,create an account,place ads on your blog and you can make money.
Its not as easy as it sounds though.. You would need to generate a lot of traffic on your blog,a fraction of whom click the ads and you get money. Cheating usually backfires with google. After you reach the 100 Dollars least required for pay off,google cancels your account.
You should goolge this topic you would find a lot of info..