How to perform particular action using REST API in CLM applications

What I am usually doing is starting Firebug and recreate the steps in web ui.
 Then you will see in net panel what are the queries sent to make particular action.

Using Firebug to snoop on the UI will not necessarily result in REST API calls. The UI uses custom calls crafted to the specific needs of the UI, not just REST API calls. Relying on these internal calls can be risky, because they can change from release to release without warning.

Following the OSLC specification is guaranteed to work. Other parts of the API that are under construction are described in the jazz.net wiki. For instance:
https://jazz.net/wiki/bin/view/Main/DraftTeamProcessRestApi

Ruby
Martha (Ruby) Andrews
Jazz Foundation L3 Development Team Lead