Spawn at the intersection of three biomes: plains, jungle and mesa. Right at the spawn you will see a horde of untamed horses and a bunch of watermelons nearby.
You can locate a small village at these coordinates: 200 75 -150, where you can start building a stable for the horses. However, you will need at least one golden apple in order to tame the horses. Some of the gold ingots and ordinary apples necessary for crafting a golden apple can already be found at the blacksmith’s chest in the village.