FTPro - Random World Mapping for Fun and (no) Profit

[Master TMO]

While I'm waiting for all the layer map slices to export, I'm browsing through the non-mapping worldbuilding threads, looking for tips about economy, trade, demographics, etc. I had some resources of my own already, and am busy bookmarking and subscribing to a bunch of others.

This is far from definitive yet, but here are the general world concept questions I am pondering at the moment:
* I wanted a world with plenty of space for the monsters and non-human races to exist, so it is not a semi-modern Renaissance-like world
** I am actually considering late Stone or Bronze Age, with maybe early Iron in a few places (dwarves most likely). Most resources are Medieval-oriented, but I can work backwards, and I already have some books on early history and tech development that I can build off of.
* How did the world generate multiple sentient races?
** Are all the races branches of the same species, or completely different?
** Are they genetically compatible for crossbreeding?
** If they are the same species, why are they so different from each other?
** Does the race have a different outlook that would affect how they build nations?
* What kinds of magic work? The standards are Wizard, Sorceror, Cleric, Druid, Shaman.
** How common is magic?
** How has magic affected a region?
* Language - just started looking at some of these resources, so I haven't really developed a whole list for it yet.
** Edit: Just read the Language Construction Kit. Now my brain hurts... I'm going to need to be a lot better rested and coherent before I attempt that again.
* Economics
** Trade very much depends on the population and tech of the world, so it can't be fleshed out until that is done.