Getting started with the SDK


I need to create a PW API based application but I am struggling with the SDK documentation : from what I have seen it seems to be code generated document listing function and struct of PW module with a brief description of parameters...What I need to perform seems quite basic : connect to PW then fetch a document, modify it and then save it back to PW. I haven't found any project in the samples showing how to fetch a document for instance. I can't imagine Bentley sells the SDK leaving users without a "Getting started" document so I think I am surely missing something...

Do you know about an overview documentation ? What would you recommand to get quickly up and running with the SDK ?