Licensing fee's are generally what you can negotiate. Most average around 7% of the net selling price. The net selling price would the be the wholesale selling price minus the shipping and handling costs and any discounts and/or returns given.
In regards to your IP, I would recommend doing a provisional which will at least give you something to hang your hat on because truly, it wouldnt stop anyone from doing what you are doing if you dont have some sort of protection.
Make sure and have the other individual sign a NDA and make sure and have a competent business attorney draft your contract.
I would also put in annual minimums so that you arent stuck if he or she decides to sit on the product. Make them reasonable and achievable but profitable to you as well.
Just my two cents.
Michael
Some delayed comments:
1: If nothing else, bundling up the documentation for the product and sending it in to the USPTO with a $110 provisional patent fee is a lot better than nothing.
2: Sometimes design patents are appropriate. These are much cheaper than regular patents, and the USPTO grants over 80% of all design patents with little discussion.
3: Look at licensing fees from the standpoint of the buyer. The buyer is going to be risk adverse and wanting to maximize his or her profit, so when you propose deals, keep this in mind. Would you take your deal? Why or why not?