I am new to Marketing cloud and recently started working on it.I have Service cloud org where i have my contact data.Now i want to connect my service cloud with marketing cloud Org.For this i Used Salesforce MC Connect.I completed this trailhead for Salesfoce MC Connect.https://trailhead.salesforce.com/en/content/learn/modules/marketing-cloud-connect But Somehow now i am not able to send the email from Service Cloud org.i am getting the queue error. I have following question now.
Do we need to set up the subscriber key before using MC connect.because its mentioned in one of help document. if Yes,How do we set up the subscriber key. I have searched enough but i didnt get how to setup suscribe key.
what is import model from Service Cloud to Marketing Cloud
How do we filter the contacts we are importing?
How do we import data from custom/standard objects
How do we set up the data extensions properly?