I would suggest you find a reputable licensing company. They are out there but they are hard to find as all the ones raking in the money dominate the advertising. It is very hard for legitimate companies and businesses to get the word out to inventors.
We've had a heck of a time just trying to let inventors know we exist.
Some companies we have found so far include:
Big Idea and Evergreen IP.
You can read about Big Idea at
We don't yet have a listing for Evergreen IP, but you can do a google search for them.
Basically, just be really skeptical and do your research when approaching a Invention Promotion or licensing firm.
Look for the major signals of a scam.
You can look at some the the resources we have been collecting at the inventor information section on scams, cons and frauds at
http://inventorspot.com/invention_cons_ ... d_problems
I'd focus on the various articles on how the scams work so you can watch out for them.