Agree - get a patent first.
Is this something that is an add-on to any ski, like an aftermarket product ? Or does this need to be built into the ski during layup ?
If added to an already completed ski, than best bet - after you get a patent - have a local fabrication shop build prototypes to your design so you can demo the product to potential customers, be it ski manufacturers, stores or the general public.
If it is something that needs to be built into the ski, during layup, than best bet is to start talking to local, small independent ski manufacturers - after you get a patent - and see if they will custom build a ski with your contraption built in. Be sure that you don't sign any type of exclusive agreement with them that limits the product only to their skis. If that doesn't work, or if there aren't any independents in your area, you can always ask around for a local 'hobby' ski maker that would be willing to make skis to your design - yes, 'hobby' ski makers do exist, but probably hard to find. Last option would be to go to a custom ski manufacturer and have them build up skis with your design - although that would be an expensive route.
You need to have a patented prototype to demo to get exposure and to get anyone's attention. Than, there's the whole marketing aspect - but we can save that for another thread....
Best of luck - hope you invention makes you the next billionaire skiing mogul - or at least the best mogul skier !