"1. Spend 10 minutes figuring out what people who evolved in each major area of your world would look like. Then spend another 5 minutes asking "2. what if this group encountered that group?" Would they fight? Trade? Both? Inter-marry and blend their genetic types? Would they remain largely separate, with pure strains of both racial groups co-existing (not necessarily peacefully)? How would that encounter be brought about in the first place?" [I added the numbers]
The land is called Wispolill (the exercise says not to name things yet, but I need working names). It's the purple continent in the top right corner. It has three areas, that northeast peninsula (Goldland), the northern half of the mainland (north of the tan, desert - called Forestland), and the southern land (Desertland).
1a. The people of the peninsula are the golden people. They are blond, from gold to platinum. Their hair is generally thick and wavy. The men almost never go bald. They have gold to bronze skin. They have gray to blue eyes and long straight noses. They are tall and slender build.
1b. The people of the northern mainland are forest people. They are shorter with dark, thin, straight hair. They have brown eyes and tan skin.
1c. The people of the desert and the southern end of the mainland are very dark skinned with nappy hair. The are tall and athletically built with swimmers' physiques. They have dark eyes.
1d. Gray land mass doesn't have a name yet, but the people of the northern part live in the fjords in small villages like the Vikings used to. The people are barrel chested with thick short limbs and fingers. They are exceedingly tall with round heads, flat, round faces. They're eyes are shades of green from hazel to deep sea green. The have very high foreheads with thin, straight black hair. Their noses are thick and wide, but flat to their faces.
At the time of the story the people of Wispolill are about to spread to other lands, being the only people with a well developed magical system they are poised to conquer.
2a. The people of the northern forest people of Wispolill have had off and on relations with the fjord people. They have fairly easy trade relations.
2b. The Golden people have always dominated the forest people. They look down on them. The forest people developed agriculture, domesticated animals and even mechanical magic first, but the Golden people always exploited their developments.
2c. The southern people have always kept to themselves and prided themselves in their nomadic history. They had trade relations with the lands to the south and the forest people, but they avoided the Golden people. The Golden people tended to treat the southerners as animals and hunted and killed them when they could. The southerners first developed flying machines, airplanes and dirigibles.