great ideas already. Also, if you get a chance to take classes on a long arm (especially if it's hands on) at a show--do! Worth it. I also have several books that I use like reference books--Angela Walters 2 Shape-by-Shape books, Amanda Murphy's, Deloa Jones 3 books, and others. Dawn Cavanaugh is a teacher for APQS and even if your machine is not one of theirs, she has great videos on different stitches too--sign up for their newsletter.
Also--your machine brand probably has a Face Book page that will be helpful on some of the maintenance issues that arise with a long arm. These are really helpful when you have a tension problem at 10pm and want to tear your hair out!