@AtlasI'm in pretty much the very same boat (plane?) as you. All of my flying until now has been in various GA aircraft with the TBM900 being the most "complicated".
The CL650 is a whole new, intimidating beast for me. I, too, found large parts of the checklists to be largely confusing given my lack of knowledge and understanding.
In addition to the great advice and references that have been posted above, I'd recommend looking at the videos posted on YouTube by "Foxtrot Alpha Aviation". He's a real CL650 pilot and is posting some very in-depth looks at various procedures and walkarounds.
He hasn't posted a full startup video yet. His latest walked us through up to and including the start of the APU. But the level of detail he's providing is excellent and I've learnt so much from him already. I'm eagerly awaiting his next video.