Assuming you are just getting started, below are few hints.

Reportable Rest:
1) To list all Defects and their Project Area names
https://<yourserver>:<port>/ccm/rpt/repository/workitem?fields=workitem/workItem[type/id='defect']/(id|projectArea/name)
2) To list all workitems Ids of type Defects for a particular project area:
https://<yourserver>:<port>/ccm/rpt/repository/workitem?fields=workitem/workItem[projectArea/name='myproject1' and type/id='defect']/id

For using SDK, I think you may not just want to list the defects but also want to do a few more things as well.
I found Ralph's blog very useful and would recommend you looking at What API’s are Available for RTC and What Can You Extend @ Ralph's Blog where you will find examples as well several links to other articles.

Hope this helps a bit.