If I'm hiring a freelancer to be my content creator and blogger for my company, how do I make sure that Copyrights for content created for our company, including all of the associated intellectual property rights with the content will be owned by our company.
It depends what the "associated" rights are. If your writer specializes say, in baby clothes and writes for hire for your site. What he or she writes for your site is your property. But what the writer then writes for other baby clothes sites is (should be) beyond your jurisdiction..