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So you are trying to prevent a person that might have copied the DB file from accessing the data within?
This means that you would need to use the methods found here:
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&sqi=2&ved=0CEYQFjAB&url=http%3A%2F%2Fdownload.microsoft.com%2Fdownload%2F4%2F7%2Fa%2F47a548b9-249e-484c-abd7-29f31282b04d%2FSQLEncryption.doc&ei=5HePUtzcEJDg2wXnwoAQ&usg=AFQjCNHkAVvzLfb_qaOaqJxvVNiQCqDcHg&sig2=U9lVlHLj8HZu7qyXISYF2w&bvm=bv.56988011,d.b2I&cad=rjt
I would make certain you have an excellent and verified backup before you do anything with encryption. One ooops factor will render your DB useless. Practice this process on a standalone instance, even on another machine or better yet, in a virtual machine, this way you can test and if it does not work you can rollback and do it again till you get it right.