Originally Posted by Kalmia:
“I was the same and wanted more Eight, so after many mentions and recommendations of it I started with Chimes of Midnight. It's not the best place to start as there are a couple of references to a longer story arc, but it's understandable and doesn't spoil things. I enjoyed it so much that I just then went back to the first story with Eight, Storm Warning, and started working my way through.
Once I've got through more of Eight's stories, I'll branch out into the other doctors I think!”
This is a good point about Chimes actually, and Storm Warning is itself a good story.
Personally I found the stories between Storm and Chimes rather unengaging. However the story immediately following Chimes - Seasons of Fear (a rare Paul Cornell contribution to the Big Finish canon) - is excellent.
So as an introduction to the PMG BF series I would probably go with Storm Warning, followed by Chimes of Midnight, followed by Seasons of Fear. If you then want to delve deeper into the story arc you can always go back and listen to the others in between (I found Wikipedia was good for providing the canonical order, back when I was buying a lot of these).
Enjoy!