Assuming you're in the U.S., once they've been created and put in a form that others can see, i.e. not just in your head, they're already copyrighted and are subject to all pertaining laws. However, it's a good idea to get them registered so that you have proof they're yours. You need to trademark your business name.
Here are a few resources:
http://www.sba.gov
http://www.copyright.gov
http://uspto.gov
Good luck! 
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