What's your experience with channel partners / partner sales / SaaS resellers?

We are in the fortunate situation that resellers of SaaS software are reaching out to us, as they want to sell our SaaS to their existing customer base. This is great, as it shows validation and aligns nicely with our plan to slowly go upmarket.

However, we have no experience in the channel partner / partner sales / reseller space. Does anyone of you? Any tips or recommendations to get the most out of this?