Terry, you should definitely take the time to watch the video tutorials on OmniOutliner available at
http://www.omnigroup.com/application...ner/tutorials/
When you've watched them, use the program for a few days, then go back and watch them again. Also, if you go to the OO extras page (click the Extras link on the page above) there's a file full of sample documents which will give you some ideas of the many ways it can be used.