You can find the QLab Wiki at wiki.figure53.com. There, you can find a large and ever-changing repository of user-contributed information about QLab, include a good number of example AppleScript-related tips and examples.
Note that many scripts which were originally written for QLab 2 may not work in QLab 3 without adjustments.
The QLab Cook Book, which you can find at http://qlabcookbook.com/, is the creation of Mic Pool, a wonderful and talented individual. The Cook Book contains a number of advanced and often complex sample workspaces, many of which include elaborate Script cues. Mic has generously published these workspaces for one and all to download and to learn from.