Legal Question in Business Law in California

You can file it yourself, or you can have an attorney versed in the subject do it right the from the start.

You probably need to do an intent to use application.

Start by going here and reading: http://www.uspto.gov/trademarks/index.jsp.

All three preceding answers are somewhat useful, but if you want to try doing it yourself, I'd also recommend going to an on-line or bricks-and-mortar bookstore and buying one or more of the several available paperback self-help law books on "how to trademark your product". One popular publisher of such books is Nolo Press, but there are others. The instructions on the USPTO Web site can be somewhat confusing, and a mistake can set you back months, so all the guidance you can get will be worth it.