I'm starting a new campaign with newbie next weekend, think on starting small dungeon crawl to introduce the rules (Sunless Citadel maybe) and after it release them into a brave new world of my 
The main idea of the world is what humans are not dominant intelligent race. Humans actually came to this world from another planet, escaped from cataclysmic threat of some kind.
Now I'm thinking how large should be a human settled territory, if they started with say million people and got a thousand years to develop? Let say they were an ancient culture, like Greek or Egyptian-like and in a thousand years with help of dwarven metalworking tech and elven magic (which they learned here, in new world) developed into a medieval tech level and strange societies.
Is a million initial humans enough to survive in new world filled with magic, dangerous species, elves, dwarves, orcs and... dragons?
Is thousand years enough?
How large is their territory now?
I think in the first years there would be high death rate because of new diseases, new environment, and who knows what. And in first 10 years the population would be halved. After people would settle down, and start living with it. After maybe a 100 years the birthrate would be better than death rate and... say well get a 10% grow per 35 years (if the land humans settle is good and they get help from locals.)
But how much land they would settle?
How much territory they need to survive and grow in numbers and advance culturally?
I have a vision of the possible societies, possible conflicts and adventures in my head... but I cant draw the map
Any Ideas?

The main idea of the world is what humans are not dominant intelligent race. Humans actually came to this world from another planet, escaped from cataclysmic threat of some kind.
Now I'm thinking how large should be a human settled territory, if they started with say million people and got a thousand years to develop? Let say they were an ancient culture, like Greek or Egyptian-like and in a thousand years with help of dwarven metalworking tech and elven magic (which they learned here, in new world) developed into a medieval tech level and strange societies.
Is a million initial humans enough to survive in new world filled with magic, dangerous species, elves, dwarves, orcs and... dragons?
Is thousand years enough?
How large is their territory now?
I think in the first years there would be high death rate because of new diseases, new environment, and who knows what. And in first 10 years the population would be halved. After people would settle down, and start living with it. After maybe a 100 years the birthrate would be better than death rate and... say well get a 10% grow per 35 years (if the land humans settle is good and they get help from locals.)
But how much land they would settle?
How much territory they need to survive and grow in numbers and advance culturally?
I have a vision of the possible societies, possible conflicts and adventures in my head... but I cant draw the map

Any Ideas?