Kichwas
Half-breed
Admit to the player that you lack the same level of knowledge, ask him to help you through the scenes, and let him know that it will take time before he gets full interaction and full benifits out of the situation.
Prewarn him that for now, they will all be kind of vague and not meeting his requests. At the end of the session tell him to email you the best bits of research for you to catch up.
One thing you can do here is open it up just a little for the player to be abusive about his knowledge - and see if he takes the bait. A good player will hold back, admitting that his PC does not know that, even if he does, or that he's abusing your lack of fore-knowledge. A bad player will take advantage of your weakpoint, and you can then take action to deal with it.
Players know you have human limits, and they know you won't know everything. If you're upfront about it you're more likely to not have trouble or lose respect over it.
Prewarn him that for now, they will all be kind of vague and not meeting his requests. At the end of the session tell him to email you the best bits of research for you to catch up.
One thing you can do here is open it up just a little for the player to be abusive about his knowledge - and see if he takes the bait. A good player will hold back, admitting that his PC does not know that, even if he does, or that he's abusing your lack of fore-knowledge. A bad player will take advantage of your weakpoint, and you can then take action to deal with it.
Players know you have human limits, and they know you won't know everything. If you're upfront about it you're more likely to not have trouble or lose respect over it.