First - do patent research lots of it.

make sure it hasn't been done before.

It is amazing how much new and improved stuff is 50 years old.

Do a market analasis on what you designed - Specifilically
a. How much money - each - can you honestly expect to make.
b. How many - can you really expect to sell
c. Do the math - honestly - after R&D,Taxes, marketing - Is itworth it

The non-discloure agreement is HUGE !!!!!!!!

Find a good lawyer - sooner or later you will need him.

Be prepared to spend a lot of your own money

Be prepared to spend years trying to get tihis done.

DO NOT USE A PATENT SERVICE - Spend the money on booze & hookers at least you will have some fun while you get screwed !!!!!!!!

Knock on doors -Face to Face - Spend money - Spend money -Spend money

Call the guy from "Anchor Sight"= http://www.archeryinnovations.com/

He DID invent the better mouse trap.

He is more than willing to share what he has learned along the way.

Good luck with your project.

In closing, I would offer that :

In buisness it is all about the money, no romantic delusions, no childhood dreams, SHOW ME THE MONEY !!!!!!!!!!!!!