How to reward this salesperson

Hi HN! I'm creating a startup which targets the fashion industry. It focusses on customer relation management, discoverability and more.

I'm fashionable myself and I am known in several high end stores, but I have no real retailer/brand network. I do have contact with a salesperson who is setting up fashion brand for himself, and he wants to help me with my startup. Ofcourse, he wants some kind of reward.

I've read some articles on the internet on the topic of rewarding sales persons, and most of them suggest not hiring anyone and just do it yourself (in the beginning). But I do think the network of this guy can be valuable. How would you motivate this relationship?