Compensation model for third party Amazon Full Service

I have the opportunity to take over the entire Amazon distribution for a manufacturer as a third-party business. The sale would take place via a seller account in the name of the manufacturer.

Does anybody have experience with something like this?

Currently, about 300,000 € per year with products of the manufacturer are turned over by other merchants. The listings are neglected, there is no PPC and the manufacturer himself does not have any influence on the current sales.

How can a sensible compensation model between me and the manufacturer look like? The manufacturer is willing to grant a share of sales. What share is justified? How can PPC costs be taken into account?

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