To create an endpoint in a WCF Data Service all you need is to add access rules for the corresponding entityset in the InitializeService static method, as described in this article
You could also use the Add OpenAccess Service wizard
to create the service automatically. The wizard will generate the whole code that you need in order to expose your persistent model via data service.
If this is not what you are looking for, please let us know and give some more details about the functionality that you are trying to achieve.
the Telerik team
Telerik OpenAccess ORM Meets ASP.NET Web API. Read more.