Once you stepped in groovy and started to control it a bit, you will probably find that the explanations in that documentation aren't enough to get a good level at groovy, and if you want to continue improving your programming skills you're going to need help at some point. To get a full reference and documentation of groovy scripting in general, you can have a look at groovy official web site at
Also a good place to ask question about groovy scripting for SexScripts is the public forums in SexScripts official website at
http://ss.deviatenow.com/viewforum.php?f=4