Welcome, I took a shot at your questions on B&B (yeah, I'm a slacker at work today). Not a complete answer by any means, but we have a great many folks with a lot of knowlege here at SRP. I'm sure you'll get good info.

I was able to view the video off this link, and I'd guess its a Dovo full hollow. I'm not sure of the specific model. You can view a bunch of them at classic shaving.com or vintagebladesllc.com.

I will add, at some point you may want to try the different grinds, but you can't go wrong starting off with a full hollow.

Jordan