A good place to start is by having a consultation (at least) with an intellectual property attorney to see what you have that can be protected. It's also important to estimate the costs and time frames for protection.
If your invention doesn't squarely fall within the normal IP protection parameters, than at least you'll know how and where to place your emphasis (and your money).
Nina L. Kaufman, Esq. is an award-winning New York City attorney, edutainer and author. Under her Ask The Business Lawyer brand, she reaches thousands of entrepreneurs and small business owners with her legal services, professional speaking, information products, and LexAppeal weekly ezine. She also writes the Making It Legal blog.