That probably just means that you haven't unlocked the researches necessary to make those goods yet. Precious goods don't get unlocked until near the end of chapter III.
Ah, I see you got to it while I was typing. Yes, whatever good you get a production boost for in the research tree will be your boost. You can also look at your city on the world map and the type of provinces situated at 12, 4, and 8 will be your boosted goods.