Using SDK instead of OSLC or Plain Java

Hello
We are trying to use the SDK instead of using OSLC or Plain Java calls, to define some logic inside the RTC server and provide this as a Jazz REST service then I was looking for examples of code (snippets) for the following Use Cases but without success:
-Creating Users
-Assign license to users
-Creating Project Areas
-Assigning process template (process definition) and initializing the project area
-Creating Team Areas
-Assign users to Team Areas and/or Project Areas
-Assign Roles to users inside Project Areas or Team Areas
-The best way to access external database from Jazz

Thanks a lot

amaury