What should I charge a client to market their product?

I am wondering what and how to charge a client to market their product. I am an outside sales representative and have several stores that will take their product on. I will also link them to my website. Do I charge a flat monthly fee or percentage of sales or what?
The sales representative business is pretty much a known paved road.
Reps get paid a percent of sales made. How much? I've heard of agreements as low as 2% and as high as 20%. Most are between 5% and 10%.

Most reps have contracts that give them guarantees of payment for a period, usually six months, after the agreement runs out, if it does. Take a look at http://www.google.com/search?source=ig&hl=en&q=sales+representatives&btnG=Google+Search">this google search for a lot more information.

-- Tim Berry
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