SAML set up for external identity provider

Looking for some guidance from the experts...

We have multiple client partners that access our sites and currently are using accounts created for them on our domain.  The request is now to move to SAML and federate with the client partners for logging into our sites.  We use PingFederate internally and we were able to set that SAML and trusted identity provider up with relative ease, but now I am working with an external client and things are not going so smoothly.  For the internal set up, I provided our admin with the endpoint and he provided the rest of the details for the powershell script to create the identity provider.   The client we are working with has provided me with metadata URI's and is looking for our metadata from SharePoint and has told me there is no way to set this up without providing the metadata.  I have no reason to doubt him, but am coming up empty handed on what information I need from him and what he needs from me.  I can't see a reason why our AD Admin would need to be involved or provide any information and i am not even sure what the metadata from SharePoint would be. 

My green-ness in this area is showing.  

Can anyone recommend a resource that will help me to communicate with the external client or provide me with the steps I need? 

THANKS! 

NLewis