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One good place to start is downloading the Useful Scripts collection on the Extras page on the OmniOutliner product website. Read through them and you'll get a taste of some of the things you can do without too much trouble. Then come back here and read everything user RobTrew has posted on the OmniOutliner forum.

You can also open the OmniOutliner dictionary in the Applescript editor and look at the various objects and methods.