Here would be my first video, Role-playing Trade 01: Placing Goods & Services:
It runs 20 minutes, which I hope is not overlong. I have a tendency to ramble when I'm voicing a video. The discussion covers in a very general way the placement of commodities and the social effects some of those commodities might have on the system as a whole. This is meant to be no more than an introduction, certainly not a detailed account of what the player ought to specifically do. I hope, however, that it leads to some thinking and consideration on the first problem, as I move forward towards what will undoubtedly be a more detailed discussion of one of the regions above.
I was asked about what common products, resources or such, ought to be included - and rather than read those off into the video, I'll just give a list here:
Precious metals - gold, silver, copper
Animal products - cheese, meat, leather
Milling - flour, animal feed
Oils - lamp, cooking, perfume
Fibres - wool, silk, hemp, cotton
Tools & woodcraft
Alchemy (including magic)
Weapons & Armor
Livestock - cattle, horses, pigs, sheep, camels, dogs, elephants
That's 49, if we count all the individual forms. That's half the 100 I suggested. Obviously, these can all be divided - and they don't include luxuries such as caviar, opium, jewelry, spices and whatnot. But then, I do expect the reader to work out their own general list and at least begin with a sense for where some of those common or odd things ought to be coming from. Remember, a single commodity will often come from multiple places! Some things will cluster around one area, others will be scattered everywhere, still others will have only a few sources. Something very special will come from only one place (high quality swords from Muscaster).
Play around a bit and I'll post again when I have done the necessary work.