How Much Money Does A Web Marketing Representative Make?

The job description involves selling web site design and search engine optimization packages to local business owners. Once the client makes a purchase, it is up to the representative to maintain a relationship with them, ensuring they’re satisfied with the services. Being able to upsell current clients is also required, as well as researching business’ and implementing SEO for clients’ website.

How Do I Write Legal Part Of Agreement “compensation For Representative”?

I have to write a representation agreement and include that the prices issued to the representative do not include any fee for the representative and he has to put his own margin on top depending on how much he spent on marketing, but at the same time keep margin reasonable and competitive for local market that he is going o be working in.
can anyone help me?
Many thanks