Before I go to call or sit down with any PM companies or individuals, I am curious how everyone has structured this relationship within their own business.

 - If you are dealing with a larger company, are they open to negotiating with you on terms or do they essentially tell you how their business does things/take it or leave it?

- If you have negotiated to the way you personally want things done, how are you structuring that arrangement and incentivizing your PM so they're not taking you for a ride but also making it worth their time and having it as mutually beneficial as possible? 

Also, any links to resources on this subject - BP or external like podcasts, articles, industry literature etc - are greatly appreciated!