Complete set of documentation can be found from here which includes some samples as well.
How to install WSO2 Carbon Studio in eclipse in a more descriptive manner can be found here.
Check the Quick Start on WSO2 Carbon Studio as well.
This release includes improved Data Services Graphical Editor which enables you to create data services descriptor files in a very user friendly easy manner.
You can ask any problem you face while try out WSO2 Carbon Studio in our forum or just drop a mail to firstname.lastname@example.org.