Once you have done your configuration described in the configuration guide on http://service.sap.com/cloud4customer, you need to do an initial load. This how-to guide describes how to do an initial load from SAP CRM to SAP Cloud for Customer.
In addition to this guide, in our CRM integrated playlist we have two videos for the initial load from CRM:
Part 1 covers the master data initial load.
Part 2 covers the transaction data initial load.