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0.) start Roo console
1.) project --topLevelPackage your.base.package.roo.addon.myaddon --template ROO_ADDON_SIMPLE
3.) perform eclipse
4.) import it into eclipse and start playing with the commands and actions, add few commands
5.) here it becomes disruptive: Learn Maven ! You need minimal maven knowledge
6.) To actually write a pretty useful addon you must checkout the ROO project itself and browse the sources. Almost every functionality that ROO provides is a ADDON so at least it's full of real life examples
7.) Enjoy :-)