I've used BM for years. I absolutely love it. I have used Laura Geller on and off for a change but I'm now back on BM. I mainly used medium beige in winter, with fairly light if I'm deathly pale and medium tan in summer. I use their Ready blush in The Faux Pas.
I also use their Ready eyeliner. But I think that might be a one off for QVC. I previously used their loose eyeliner.
They go into detail about the colours on QVC so you might be able to find a video - although I have a feeling they discuss the various female presenters and what shade would be appropriate for them so unless you know who they are talking about this information is useless LOL
I'm a dark olive skinned baby if that helps any. Think Spanish/Italian. I can wear medium beige almost all year round. Medium tan is best once I have a tan but I can cope with medium beige and a bronzer if I'm stuck. I can also wear fairly light in the depths of winter when I'm quite pale but that's a rarity and usually only if I've seen devil all sunshine for most of the summer. But again I can wear it and warm it up with a bronzer.
I have no pink tones in my skin at all. In my head I don't think I'm yellow toned either but I clearly am. And I think that's the key with BM. Get the colour family right and it makes it easier.