Unfortunately, there is currently no tutorial to get you started with GL Galore. The internet, however, is full of beginner's tutorials for OpenGL which you can use to get into the engine. Since GL Galore just wraps the OpenGL API, it is mostly simple and straightforward to port code written for other programming languages to GL Galore. The examples that are shipped with GL Galore can also help you to get started with GL Galore.
Finally, the Hollywood forums are always a good place to ask your question if you're stuck programming with GL Galore. Just visit http://forums.hollywood-mal.com and ask.