Creating an entity record with silverlight

Hi everyone,

I posted a similar post earlier; but have decided to re-phrase the question in a way that I'm hoping is easier to answer.

My issue is that I need to create opportunity records with Silverlight into CRM 2011.  I've been successful in creating a Contact but not in Opportunity.  Could anyone either explain to me what needs to be done to create an opportunity record, or how to do it?

Thanks,

Bmckie