Many plugins do have tutorials on their product pages under the Tutorial tab or on Youtube, however, not all products have tutorials available.
All of our plugins install into one or more of Final Cut Pro's motion templates libraries and this will help you to determine how to get started with a plugin.
Additionally, if you are looking for tutorials on how to get the most out of Final Cut Pro we recommend checking out our free Final Cut Pro tutorial series.
Enjoy the tutorials on our site here:
https://store.pixelfilmstudios.com/final-cut-pro-x-tutorials/
Or save the playlist on Youtube:
https://www.youtube.com/playlist?list=PLsLfbikc5vwD0HZIkIZr8MzkSr27kZTaB