I have a software.

Somebody wants to approach businesses to sell it.

What would be a fair percentage of the sale to give to that person when sales are made?

I know that some factors could change that percentage. For example that person should get less if she just gives my business card to a potential customer. Still that person should have a percentage.

You have a url to suggest where a topic like that would be discussed. Or give your feedback about deals like that?